landscaping without harmful invasive plants · 2017-02-20 · 4 landscaping without harmful...
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Landscaping without harmful invasive plantsA guide to plants you can use in place of invasive non-natives
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2 LANDSCAPING WITHOUT HARMFUL INVASIVE PLANTS 3A PLANTLIFE / RHS GUIDE
A few popular landscaping plants can cause problems for
you / your clients and the environment. These are known as
invasive non-native plants. Although they comprise a small
minority of the 70,000 or so plant varieties available, the
damage they can do is extensive and may be irreversible.
Some invasive non-native plants might be
straightforward for you (or your clients) to keep in
check if you can tend to the planted area often, but
in the wider countryside, where such management
is not feasible, these plants can establish and cause
problems for native plants and animals. Trying to
get rid of problem plants from natural habitats,
especially sites of nature conservation importance, is
expensive and diffi cult. Often complete eradication
of an invasive plant from the wild becomes impossible,
and many hundreds of thousands of pounds are spent
each year in an effort to limit their spread.
Other invasive non-native plants will cause problems in their
amenity setting too, quickly outgrowing their space and
becoming diffi cult to keep under control. If invasive plants are
used in water features, they can present an additional hazard
as rampant growth can make water appear as solid ground
and so be dangerous to unsuspecting children or animals.
These websites provide more information about
invasive plants and their management:
Plantlife
www.plantlife.org.uk
Royal Horticultural Society
www.rhs.org.uk
Non-Native Species Secretariat
www.nonnativespecies.org
This guide, produced by the wild plant conservation
charity Plantlife and the Royal Horticultural
Society, can help you choose plants that are
less likely to cause problems to the environment
should they escape from your planting area.
Even the most careful land managers cannot
ensure that their plants do not escape and
establish in nearby habitats (as berries and
seeds may be carried away by birds or the
wind), so we hope you will fi nd this helpful.
Under the Wildlife and Countryside
Act, it is an offence to plant, or cause to
grow in the wild, a number of invasive
non-native plants. Government also
has powers to ban the sale of invasive
plants. At the time of producing this
booklet there were no sales bans, but
it is worth checking on the websites
below to fi nd the latest legislation
that may be relevant to you:
Department for Environment Food and Rural Affairs www.defra.gov.uk
Scottish Government www.scotland.gov.uk/invasivespecies
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An unsuspecting sheep fl ounders in a river. Invasive Floating Pennywort can cause water to appear as solid ground.
Landscaping without harmful invasive plants
4 LANDSCAPING WITHOUT HARMFUL INVASIVE PLANTS 5A PLANTLIFE / RHS GUIDE
Symbols under each plant highlight particular conditions the plant requires (for example, wet, dry, acid or alkaline soils, or full sun). Plants able to grow in shade are also indicated. A plant with no symbols is able to cope with a broad range of conditions. The index at the back of this booklet provides full details of each plant’s cultivation tolerances.
Groundcover plants 6
Naturalising plants & bulbs 8
Architectural plants 11
Shrubs 14
Climbers / Wall cover 21
Trees 23
Pond & bog garden plants 27
Plants for wildlife 32
Cultivation chart & index 36
How to use this guide
Your choice of plant often refl ects what you want to do – for example create
a stunning visual display in a public park, or provide a barrier to discourage
use of a certain area. Here we try to suggest non-invasive plants for a
variety of different landscaping occasions and cultivation conditions.
Invasive plants have sometimes been used in the past for those diffi cult areas
of landscaping, like when a bare wall needs to be covered quickly or soil needs
to be stabilised. Meanwhile plants for other aspects of landscaping, such as
summer bedding, are unlikely to be invasive. This booklet covers those areas
of landscaping where, traditionally, invasive plants have most been used.
For example, some cotoneasters used for background screening and
groundcover are now displaying invasive tendencies in the wild and have been
added to Schedule 9 of the Wildlife and Countryside Act. We suggest safer
plants you can try instead in the 'Shrubs' and 'Groundcover plants' sections.
CONTENTS Our suggested plants are divided into eight sections PAGE
Although the plants we suggest shouldn’t cause you undue
problems, no matter which plants you use, you/your client will
need to manage your planted areas at regular intervals.
Please remember that ALL excess plant matter should be
disposed of responsibly. The Be Plant Wise website has more
information about safe disposal of plant matter:
www.nonnativespecies.org/beplantwise
Tolerant of shade
/ low light levels
Fine autumncolours
Submergedaquatic plant
Needs sun
Bears ornamental
fruit
Floatingaquatic plant
Needs acid conditions
Windbreak
Bog gardenplant
Needs alkaline conditions
Background structure /screening
Marginal / emergent
aquatic plant
Needs drier soils
Berries for birds
Fast growing
Needs rich soil
Needs poor soil
Low barrier / hedge
Needs wetter soils
Nectar source
Attractive fl owers
Provides shelter/cover
for wildlife
Attractive foliage
Within each section the recommended plants cover a range of different sites and cultivation requirements. For example, we list shrubs which offer spring or summer fl owers or stunning autumn colours, shrubs that are good for hedging or providing background structure to your borders, and shrubs for sunny or shady spots.
KEY TO SYMBOLS
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CreditsImages used under Creative Commons licences (1-7):
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Images used under GNU Free Documentation License, Version 1.2
Front cover image © Martin McCarthey-iStockphotoInside layout design by Andrew Evans
6 LANDSCAPING WITHOUT HARMFUL INVASIVE PLANTS 7A PLANTLIFE / RHS GUIDE
Groundcover plantsGroundcover plants
Erosion control
Ligustrum vulgareWild Privet
Hardy semi-evergreen shrub to 3m with narrowly oval, shiny leaves. Spikes of white fl owers are followed by small black fruit.
Calluna vulgarisHeather
Variable shrub to 60cm with tiny, densely packed leaves and bell-shaped, often pink fl owers. A great range of cultivars selected for fl ower and foliage characters is available. A good option for erosion control at inland sites.
Rhamnus catharticaBuckthorn
Dense-growing, spiny shrub to 6m with glossy, dark green leaves turning yellow in autumn. Yellowish fl owers in spring are followed by spherical fruit in autumn, red turning black.
Prunus spinosa 'Plena'Double Blackthorn
Shrub to about 4m with spiny branches and double, white fl owers in March and April.
Ulex europaeusGorse
Rounded shrub of dense habit to 2.5m bearing very spiny stems which carry bright yellow pea fl owers throughout much of the year.
Ceratostigma plumbaginoidesHardy Plumbago
Rhizomatous perennial, woody at the base with wavy-margined, bright green leaves (to 10cm long) turning red in autumn. Produces clusters of bright blue fl owers in late summer. Good for exposed sites.
Leucothoe fontanesianaDrooping Laurel
Shrub to 2m or so with arching branches carrying evergreen, leathery, lance-shaped leaves and small white fl owers in spring. Variegated cultivars are available. Needs a sheltered position.
Pachysandra terminalisCarpet Box
Evergreen perennial spreading on smooth stems from which are produced deeply cut, glossy, dark green leaves. Small white fl owers are produced in early summer.
Salix repens var. argenteaCreeping Willow
Prostrate, spreading shrub with oval, silky green leaves that are silver beneath. Produces yellow catkins in spring. Good for exposed, sunny sites.
Bergenia cordifolia & hybridsElephant-ears
Robust perennials spreading on thick, branching rhizomes. Leaves are large, glossy and paddle-like and purple-tinged in winter. The fl owers are usually in shades of pink, borne on fl eshy stems. Good for sheltered sites.
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8 LANDSCAPING WITHOUT HARMFUL INVASIVE PLANTS 9A PLANTLIFE / RHS GUIDE
Groundcover plantsNaturalising plants
& bulbs
Stachys byzantinaLamb's-ear
Spreading perennial to 45cm tall with elliptic leaves to 10cm which are covered in thick white wool. Small pinkish fl owers are carried on woolly stems in summer and autumn. Good for sunny, exposed sites.
Sarcococca hookeriana var. humilisChristmas Box
Low-growing, suckering shrub grown for its glossy, dark green, narrow leaves and small but fragrant, pink-tinged white fl owers produced in winter. The fl owers are followed by dark, shiny fruit.
Crocus bifl orusSilvery Crocus
Variable cormous perennial to 6cm carrying fl owers which have yellow throats and can be found in shades of blue or white, sometimes with purple striping.
Colchicum autumnaleMeadow Saffron
Cormous perennial producing copious pink, goblet-shaped fl owers (to 15cm), followed by lance-shaped leaves. Double-fl owered cultivars are available.
Colchicum speciosumGiant Meadow Saffron
Vigorous, cormous perennial to 18cm with narrow leaves. Goblet-shaped fl owers are pink-purple, often with a white throat.
Crocus chrysanthusGolden Crocus
Cormous perennial to 5cm with fl owers which can vary in colour from pale cream to deep yellow, often with a purplish suffusion on the exterior.
Crocus tommasinianusEarly Crocus
Variable cormous perennial to 10cm with pale-striped linear leaves and fl owers which can be pale lilac to deep purple.
Cyclamen coumEastern Sowbread
Tuberous perennial to 8cm with silver-patterned, rounded, deep green leaves and fl owers in shades of pink with swept back tepals.
Cyclamen hederifoliumSowbread
Tuberous perennial producing waxy heart-shaped or triangular leaves with pale patterning. The fl owers are in shades of pink, borne singly on upright stems and have twisted, swept back tepals.
Crocus nudifl orusAutumn Crocus
Spreading, cormous perennial to 20cm. Its purple fl owers with a long tube are produced before the narrow leaves.
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10 LANDSCAPING WITHOUT HARMFUL INVASIVE PLANTS 11A PLANTLIFE / RHS GUIDE
Naturalising plants& bulbs
Architectural plants
Fritillara meleagrisSnake's-head Fritillary
Bulbous perennial to 30cm with delicate stems that carry heavy, pendant fl owers (to 4.5cm long). The fl owers are in shades of pinkish purple with dark checkering.
Echium vulgareViper's-bugloss
Bushy biennial bearing bristly, narrow leaves and in the second year purple, pink-tinged, bell-shaped fl owers in dense infl orescences.
Scilla sibericaSiberian Squill
Bulbous perennial to about 15cm with shiny, lance-shaped leaves and pendant, bright blue fl owers to 1.5cm across.
Narcissus 'Actaea'Daffodil 'Actaea'
Strongly fragrant bulbous perennial to 45cm. The white fl owers have a short, cup-shaped corona which is yellow margined red. Leaves are narrow and hairless.
Ampelodesmos mauritanicaDiss Grass
Impressive grass to 3m with arching, evergren foliage and tall stems bearing pendant fl owers.
Chusquea culeouChilean Bamboo
Erect, clump-forming bamboo with solid, yellow-green stems growing to 6m in ideal conditions with a spread of 2.5m.
Fargesia nitidaFountain Bamboo
Graceful, slow-growing bamboo forming clumps of slender, dark purple canes growing to a height of 5m with a spread of 1.5m.
Miscanthus giganteusElephant Grass
Upright grass not spreading invasively, useful at the back of borders. Flowers are pinkish going silver, produced in October. Tolerant of most conditions but best in fertile, moist soil in full sun.
Astelia chathamicaSilver Spear
Clump-forming perennial to 1.2m tall bearing clumps of broad, channelled, silvery leaves. Yellowish green fl owers are sometimes produced and followed by orange berries.
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Digitalis purpureaFoxglove
Biennial forming a neat rosette of hairy leaves in the fi rst year followed in the second by graceful, one-sided spikes to 2m of tubular, purple fl owers with maroon spots on the inside.
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12 LANDSCAPING WITHOUT HARMFUL INVASIVE PLANTS 13A PLANTLIFE / RHS GUIDE
Architectural plants Architectural plants
Stipa giganteaGolden Oats
Forms dense, evergreen clumps over which are carried high plumes of golden fl owers.
Pleioblastus simoniiSimon's Bamboo
Fairly small bamboo to 3m in height. The variegated cultivar 'Variegatus' has linear, white-striped leaves
Crambe cordifoliaGreater Sea-kale
Huge clumps of heart-shaped foliage to 1.5m across are topped by branching sprays of small white fl owers to 2m high.
Aralia cachemiricaAngelica-tree
Huge leaves to 1.2m long divided into shiny leafl ets above which appear spikes of starry umbels to 3m tall.
Datisca cannabinaCretan Hemp
Slender stems to 3m bear delicate, dissected leaves and tassels of green fl owers.
Rheum palmatumOrnamental Rhubarb
A huge ornamental rhubarb to 2.5m tall or more with large, deeply lobed leaves and upright spikes of small greenish fl owers.
Rodgersia aesculifoliaChestnut-leaved Rodgersia
Large, wrinkled basal leaves are palmately divided and bear branching stems of small pink or white fl owers. Forms clumps to 1.5m across.
Veronicastrum virginicumCulver's Root
Perennial to 2m or more bearing architectural whorls of toothed foliage and tall wands of lilac fl owers.
Phyllostachys nigraBlack Bamboo
Clump-forming bamboo with arching, slender canes turning deep black. Grows to 5m with a spread of 3m.
Eupatorium maculatum Atropurpureum GroupJoe Pye Weed
Perennial to 3m with domed heads of purple fl owers over whorls of dark foliage.
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14 LANDSCAPING WITHOUT HARMFUL INVASIVE PLANTS 15A PLANTLIFE / RHS GUIDE
Shrubs Shrubs
Cornus albaWhite Dogwood
Hardy and resilient deciduous shrub to 3m tall bearing red bark and available as several variegated cultivars. Grow in full sun for most striking stem colour.
Buxus sempervirensBox
Dense-growing, rounded shrub eventually to 5m but responding well to pruning. Leaves evergreen, small and dark green. Produces small and yellowish fl owers in spring. Good for dry, shady sites.
Escallonia macranthaEscallonia
A fi ne shrub to 4m but easily pruned with dark, glossy, aromatic leaves and tubular, rosy fl owers. Good as a windbreak, though may be susceptible to frost in inland areas.
Elaeagnus ebbingeiEbbinge's Silverberry
Evergreen shrub to 4m with a dense, leafy habit. Leaves are leathery with silver scales on the underside. Variegated cultivars are available. Extremely fragrant, small, white fl owers are produced in autumn.
Forsythia intermediaForsythia
Easily propagated, pollution-tolerant deciduous shrub to 2m tall bearing bright golden fl owers on bare stems in spring.
Hebe rakaiensisRakai Hebe
Dense shrub to 1m with glossy green leaves to 2cm long thickly covering a rounded bush. The white racemes of fl owers (to 4cm long) are borne in summer. Good for hedging. Will tolerate maritime exposure but not very cold winds.
Hebe topiariaTopiarist's Hebe
Dense, low-growing shrub to 60cm with glossy, grey-green leaves to 1.5cm long. Racemes of white fl owers to 2cm are carried in summer. Good for hedging. Will tolerate maritime exposure but not very cold winds.
Ilex aquifoliumHolly
Hardy evergreen shrub bearing spiny, glossy foliage when young. Available in a range of variegated cultivars. Female plants bear red berries. Good as a windbreak.
Berberis verruculosaWarted Barberry
Tight-growing, evergreen shrub to 1.5m with glossy, spiny leaves to 3cm long, that are white on the underside. Dark purple fruit to 1cm long follow the golden yellow fl owers.
Garrya ellipticaSilk-tassel Bush (pictured: cultivar ‘James Roof’)
Hard-wearing evergreen shrub to 4m with glossy, grey-green, opposite leaves. Highly ornamental catkins are borne in winter and early spring. Good windbreak.
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16 LANDSCAPING WITHOUT HARMFUL INVASIVE PLANTS 17A PLANTLIFE / RHS GUIDE
Shrubs Shrubs
Olearia haastiiDaisy-bush
Tough, bushy evergreen shrub to 2m tall with dark green leaves felted on the underside. Produces daisy fl owers in summer.
Photinia fraseriChristmas Berry
Evergreen shrub growing to 5m but easily pruned to size. White fl owers are carried in spring and young foliage is bright red. Needs protection from cold winds.
Olearia macrodontaNew Zealand Holly
Shrub, eventually to 5m, with holly-like, greyish leaves. Profuse heads of fragrant, daisy-like fl owers are borne in summer. A good windbreak.
Euonymus japonicus & cultivarsEvergreen Spindle
Evergreen shrub with glossy foliage and small clusters of white fl owers. Tolerant of a wide range of conditions and resilient to heavy pruning. A number of fi ne foliage selections are available.
Viburnum opulusGuelder-rose
Vigorous deciduous shrub to 4m bearing lobed leaves that turn red in autumn. Its lacecap fl owers are followed by glossy red fruit.
Abelia grandifl oraGlossy Abelia
Semi-evergreen shrub to 3m bearing glossy, dark green leaves and fragrant pinkish white tubular fl owers that fall to reveal persistent pink calyces.
Aucuba japonica 'Crotonifolia'Spotted-laurel
Dependable shrub to 3m tall grown primarily for its glossy, toothed leaves (to 20cm long) which are speckled with yellow markings. Small purple fl owers may be followed by bright red berries. Good for dry, shady sites.
Camellia japonica cultivarsCommon Camellia
Evergreen shrubs to 4m or more, with glossy, toothed elliptic leaves. A huge number of cultivars have been selected often with large double fl owers in shades of pink.
Ligustrum lucidumChinese Privet
Evergreen shrub or tree easily pruned to size with glossy, dark green leaves. Variegated cultivars are available.
Acer palmatum var. dissectumCut-leaved Japanese Maple
Rounded shrub bearing deeply cut, sometimes purple, foliage that colours up well in autumn and is often accompanied by ornamental winged fruits. Protect from cold, drying winds.
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18 LANDSCAPING WITHOUT HARMFUL INVASIVE PLANTS 19A PLANTLIFE / RHS GUIDE
Shrubs Shrubs
Euonymus europaeus 'Red Cascade'Spindle 'Red Cascade'
Deciduous shrub to 2.5cm bearing glossy leaves on green stems and small fl owers. Flowers are followed by a profusion of red fruit which open to reveal the orange-coated seeds within.
Hamamelis vernalisSpring Witch-hazel
Upright shrub bearing spidery yellow or orange fl owers on bare twigs in winter and spring. The leaves turn clear yellow in autumn.
Euonymus alatusWinged Spindle
Hardy shrub to 2m bearing glossy leaves that turn bright scarlet before falling. Also bears purple and orange fruit and winged stems.
Hydrangea serrataLacecap Hydrangea
Deciduous shrub with opposite leaves to 15cm long and fl attened domes of fl owers which bear colourful sterile bracts at the margins. Many cultivars are available.
Hydrangea macrophyllaMophead Hydrangea
Compact, deciduous shrub to 2m with opposite, broad leaves to 20cm long. There are many cultivars which bear domes of fl owers in a great range of colours, some formed of entirely sterile bracts and others with fertile fl owers at the centre.
Nandina domesticaHeavenly Bamboo
Bamboo like stems carry graceful compound, evergreen leaves that turn vivid red in autumn and winter. Small, starry fl owers are sometimes followed by bright red fruit. Requires a sheltered site to thrive.
Philadelphus coronariusMock-orange
Shrub to 3m bearing toothed, deciduous leaves and highly fragrant, creamy, cup-shaped fl owers (to 2.5cm across) in early summer.
Pieris japonicaLily-of-the-valley Bush
Evergreen shrub of neat habit to 4m tall with toothed elliptic leaves that are reddish when young. Panicles of numerous urn-shaped, white fl owers appear from pink buds. Several cultivars are available. Protect young growth from late frosts.
Osmanthus burkwoodii Burkwood Osmanthus
Evergreen shrub to 3m with a dense habit and toothed, dark green leaves. The small, tubular white fl owers are extremely fragrant.
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Cotinus coggygriaSmoke Tree
Shrub to 5m with oval leaves turning rich orange and red in autumn and retaining whispy panicles after fl owering. Purple-leaved forms available. Coloured-leaved cultivars perform best in full sun.
Summer
Summer
Summer
Spring
Spring
20 LANDSCAPING WITHOUT HARMFUL INVASIVE PLANTS 21A PLANTLIFE / RHS GUIDE
ShrubsClimbers / Wall cover
Viburnum betulifoliumBirch-leaf Viburnum
Deciduous shrub with an upright habit growing to 3m tall. The white fl owers in early summer are followed by pendant clusters of bright red fruit which persist well through the winter.
Viburnum burkwoodii cultivarsBurkwood Viburnum
Evergreen shrub to 3m with dark green, shiny leaves. Globes of very fragrant white fl owers to 10cm across open from pink buds and are sometimes followed by small red fruit (turning black).
Skimmia japonica 'Nymans'Skimmia 'Nymans'
A spreading shrub to 1m x 2m bearing glossy, evergreen, aromatic foliage. Fragrant white fl owers and round, red fruits are freely produced.
Actinidia kolomiktaKolomikta
Vigorous twining climber to 5m or more, rarely producing its small fl owers but bearing large leaves that become attractively variegated white and pink in the upper half.
Ampelopsis brevipedunculataPorcelain Berry
Deciduous tendril climber to 5m bearing three-lobed leaves and small greenish fl owers which are followed by clusters of round fruit that turn from pinkish-purple to blue.
Celastrus orbiculatusStaff-vine
Strong-growing deciduous climber to 14m bearing toothed leaves turning golden in autumn. Small, greenish fl owers are followed by round, yellowish fruit that open to reveal red seeds within.
Chaenomeles japonicaJapanese Quince
Spreading, thorny shrub to 1m tall and 2m across bearing large orange-red fl owers in spring as the glossy leaves appear. The fruits are red, tinged with yellow and around 4cm long.
Ceanothus arboreus 'Trewithen Blue'Californian Lilac 'Trewithen Blue'
Evergreen shrub to 5m or so with glossy, dark green, oval leaves to 10cm long. In spring and summer frothy heads of blue fl owers are borne in abundance. May be damaged by frosts.
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Sarcococca hookerianaSweet Box
Small, suckering shrub to 1.5m forming neat clumps of upright stems which bear glossy, broadly lance-shaped leaves. In winter, clusters of sweetly fragrant, small white fl owers form and are followed by shiny black fruit. Good for dry, shady sites.
Spring
22 LANDSCAPING WITHOUT HARMFUL INVASIVE PLANTS 23A PLANTLIFE / RHS GUIDE
Climbers / Wall cover Climbers / Wall cover
Hedera algeriensis 'Gloire de Marengo'Ivy 'Glorie de Marengo'
Large-leaved ivy with creamy marginal variegation and long, easily trained stems. Tolerant of a wide range of conditions once established.
Hedera colchica 'Sulphur Heart'Persian Ivy 'Sulphur Heart'
Large-leaved ivy with a large central, golden variegation growing to perhaps 5m. Tolerant of a wide range of conditions once established.
Euonymus fortunei 'Silver Queen'Spindle 'Silver Queen'
Evergreen shrub to 2.5m with fl exible stems bearing waxy, white-margined leaves. White fruit opening to reveal orange-coated seeds may be produced after the small fl owers.
Myrtus communisCommon Myrtle
Evergreen shrub to 3m bearing a dense coverage of dark green aromatic foliage and, from midsummer, white fl owers with prominent stamens which are followed by black fruit. Not fully hardy; shelter from cold winds.
Hydrangea petiolarisClimbing Hydrangea
Deciduous climber with leaves turning yellow before falling. Grows to 10m or more and carries domes of white fl owers with bracteate fl owers at the margins. Avoid shallow, chalky soils.
Rosa 'New Dawn'Rose 'New Dawn'
A vigorous climbing rose with arching stems bearing glossy leaves and full, palest pink fl owers. Suitable for sun or partial shade. A great range of climbing roses, providing for different aspects and effects, are available.
Acer palmatumJapanese Maple
Small tree bearing graceful, lobed leaves that become scarlet in autumn. Many choice cultivars are available.
Arbutus andrachnoidesHybrid Strawberry Tree
Tree to 8m with peeling red bark and glossy, toothed evergreen leaves that are glaucous on the underside. The small fl owers are white and appear in autumn. Alkaline soils may be tolerated but acid is preferred. Shelter from cold winds.
Vitis coignetiaeCrimson Glory-vine
Vigorous, tendril climber with large, lobed leaves to 30cm across that turn yellow, then bright red, in autumn.
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Evergreen shrub to 4m with a dense, leafy habit. Leaves are leathery with silver scales on the underside. The fl owers, produced in autumn are small, white and extremely fragrant. There are several variegated cultivars.
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24 LANDSCAPING WITHOUT HARMFUL INVASIVE PLANTS 25A PLANTLIFE / RHS GUIDE
Trees Trees
Crataegus lavalleeiLavalleei's Hawthorn
Spreading, semi-deciduous tree to 7m bearing domed heads of white fl owers followed by orange-red fruits to 2cm across that persist through the winter.
Fraxinus angustifolia 'Raywood'Ash 'Raywood'
Pinnate-leaved deciduous tree to 20m bearing foliage that turns a rich red in the autumn.
Crataegus laevigata 'Paul's Scarlet'Hawthorn 'Paul's Scarlet'
Thorny, deciduous tree to 8m. Bears a great profusion of bright red-pink, very double fl owers in late spring.
Ligustrum lucidumChinese Privet
Hardy, conical evergreen tree to 10m bearing glossy leaves. Spikes of white fl owers in late summer are followed by bluish fruit.
Fraxinus ornusManna Ash
Deciduous tree to 15m with pinnate leaves that turn red in autumn. Creamy white fl owers are followed by pendulous clusters of winged yellow or red fruit.
Liquidambar styracifl uaSweet Gum
Conical tree to 20m with neatly lobed leaves turning deep bronze, red and orange before falling. For best autumn colour plant in full sun. Can tolerate alkaline conditions where soils are deep.
Malus 'Golden Hornet'Crab Apple 'Golden Hornet'
Deciduous tree to 8m with a rounded habit. White fl owers in spring are followed by copious, spherical, golden yellow fruit to 2cm across which are carried over a long period.
Nyssa sylvaticaTupelo
Broadly conical tree to 15m. Leaves produce spectacular fi ery shades in autumn. Shelter from cold winds and plant out when young.
Magnolia grandifl oraLarge-fl owered Magnolia
Magnifi cent evergreen tree to 10m or more with large, very glossy, bright green leaves that are rusty brown on the underside. Bears huge, cup-shaped, fragrant white fl owers. May be damaged by very cold weather.
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Deciduous tree to 10m bearing pink, pea fl owers which appear on the bare stems. The attractive foliage is glossy and heart-shaped.
26 LANDSCAPING WITHOUT HARMFUL INVASIVE PLANTS 27A PLANTLIFE / RHS GUIDE
Trees Pond & bog garden plants
Sorbus ariaCommon Whitebeam
Deciduous tree to 15m or more with broad, hairy, greyish leaves and fl at heads of white fl owers which are followed by dark red fruits.
Sorbus 'Joseph Rock'Mountain Ash 'Joseph Rock'
Deciduous tree to 10m bearing pinnate leaves that colour well in autumn. Spring white fl owers are followed by round, pale yellow fruit to 1cm across.
Prunus cerasifera 'Pissardii'Cherry Plum 'Pissardii'
Purple-leaved deciduous tree to 10m bearing cup-shaped fl owers (2.5cm across) that are pink, fading to white.
Alisma plantago-aquaticaWater-plantain
Perennial to 1m bearing linear submerged leaves and rosettes of long-stalked, lance-shaped, greyish leaves above the water. Produces very pale pink fl owers to 1.5cm on much-branched infl orescences in summer. Best in water 15-30cm deep.
Sorbus thibetica 'John Mitchell'Tibetan Whitebeam 'John Mitchell'
Deciduous tree to 20m or so with very broad, round, silver-grey leaves with heads of white fl owers in spring followed by yellowish fruit to 1.5cm across.
Butomus umbellatusFlowering-rush
Perennial to 1.5m with rush-like, twisted leaves emerging purple and turning green. Umbels of fragrant pink fl owers to 2.5cm across are borne in late summer on tall stems. Grow in mud or water to 25cm deep.
Caltha palustrisMarsh-marigold
Rhizomatous perennial bearing kidney-shaped leaves to 10cm long. Open, waxy, yellow fl owers are carried on stems to 45cm in spring.
Canna 'Endeavour'Water Canna 'Endeavour'
Tender, rhizomatous perennial to 1.8m with erect, glaucous, paddle-shaped leaves and spikes of narrow-petalled red fl owers to 5cm across in summer and autumn. Lift tubers and overwinter in frost-free conditions.
Callitriche stagnalisCommon Water-starwort
Oxygenating perennial with narrow, opposite submerged leaves that become broader in the open air. The fl owers are small and insignifi cant, borne in summer.
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28 LANDSCAPING WITHOUT HARMFUL INVASIVE PLANTS 29A PLANTLIFE / RHS GUIDE
Pond & bog garden plants Pond & bog garden plants
Carex elata 'Aurea' Bowles's Golden Sedge
Rhizomatous, perennial sedge to 70cm, dying back in winter with leaves that bear a central, golden variegation. Small fl owers are produced in spring and early summer.
Ceratophyllum demersumRigid Hornwort
Submerged oxygenating plant with low light requirements. Perennial with stiff stems eventually growing to 1m if left unchecked. Leaves are dark green and forked into linear, toothed segments. Prefers quite nutrient rich water.
Canna 'Ra'Water Canna 'Ra'
Tender, rhizomatous perennial to 1.8m with erect, slender, green leaves and spikes of exotic lemon yellow fl owers in summer and autumn. Lift tubers and overwinter in frost-free conditions.
Fontinalis antipyreticaWillow Moss
Attractive, evergreen, oxygenating moss lacking proper roots with shoots to 15cm long and tightly packed leaves to 5mm.
Eleocharis acicularisNeedle Spike-rush
Rhizomatous oxygenating perennial to 10cm with rush-like leaves and fl owers in spikelets to 5mm (not produced when submerged).
Hosta 'Sum and Substance'Plantain Lily 'Sum and Substance'
Large, ribbed, heart-shaped yellow or green leaves and spikes of bell-shaped lilac fl owers in summer.
Iris pseudacorusYellow Iris
Vigorous, rhizomatous perennial to 1.5m tall with lance-shaped, greyish leaves and bright yellow fl owers with darker markings. FOR LARGE PONDS ONLY.
Mentha aquaticaWater Mint
Rhizomatous perennial to 90cm with purple stems and narrow, toothed, hairy and aromatic leaves. In summer dense spheres of tubular lilac fl owers are produced. Grows in water to 15cm deep. Plant in baskets to contain spread.
Hydrocharis morsus-ranaeFrogbit
Stoloniferous perennial spreading on the surface of water and producing rounded, glossy leaves to 3cm long. White, bowl-shaped fl owers, 2cm across, yellow at the centre are borne in the summer. Less vigorous in deeper water.
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30 LANDSCAPING WITHOUT HARMFUL INVASIVE PLANTS 31A PLANTLIFE / RHS GUIDE
Pond & bog garden plants Pond & bog garden plants
Myriophyllum spicatumSpiked Water-milfoil
Perennial oxygenator with whorls of deeply divided leaves borne on stems to 1m or more. In summer small reddish fl owers are carried just above the water.
Myriophyllum verticillatumWhorled Water-milfoil
Perennial oxygenator with whorls of deeply divided leaves and linear leafl ets borne on stems to 1m or more. In summer very small yellowish fl owers are carried just above the surface of the water.
Myosotis scorpioidesWater Forget-me-not
Creeping, rhizomatous perennial with leaves to 10cm and, in summer, a profusion of bright blue, very open fl owers to 8mm across with a paler eye. Grows best in water to 10cm deep.
Nymphaea alba White Water-lily
Perennials with fl oating, rounded, dark green, often red-tinged leaves to about 30cm across. The starburst fl owers to 20cm or more across are white with yellow centres. FOR LARGE PONDS ONLY.
Nuphar luteaYellow Water-lily
Perennial bearing fl oating, rounded, thick-textured, hairless leaves to 40cm long. Above these in the summer are carried almost spherical yellow fl owers to 6cm across singly on stems. FOR LARGE PONDS ONLY.
Nymphaea hardy hybridsGarden Water-lily
There are many hybrids to choose from. Nymphaea 'Marliacea Albida' (pictured) has cup-shaped fl owers to 15cm across that are white with yellow centres.
Ranunculus aquatilisCommon Water-crowfoot
Pretty annual/short-lived perennial with submerged branching stems and fi nely divided leaves and fl oating lobed, kidney-shaped leaves. Produces white fl owers (2cm) at the water's surface in summer. Prefers shallow water with good nutrient levels.
Sagittaria sagittifoliaArrowhead
Spreading perennial bearing arrow-shaped leaves with long lobes at the base and 1m tall infl orescences carrying white fl owers to 2.5cm across. In deep water long, fl oating leaves may also be produced. FOR LARGE PONDS ONLY.
Potamogeton crispusCurled Pondweed
Perennial oxygenator bearing submerged, dissected, almost transluscent leaves and leathery, fl oating leaves with very undulating margins. The fl owers are very small and whitish, carried just above the water.
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Rhizomatous perennial forming fl oating mats of three-parted leaves with leafl ets to 6cm long. Erect infl orescences of white, star-shaped fl owerrs are sometimes produced in summer. WILL NEED REGULAR TRIMMING; FOR LARGE PONDS ONLY.
32 LANDSCAPING WITHOUT HARMFUL INVASIVE PLANTS 33A PLANTLIFE / RHS GUIDE
Pond & bog garden plants Plants for wildlife
Buddleja globosaOrange-ball-tree
Erect, deciduous shrub with orange fl owers borne in eye-catching spheres in June. May be damaged by hard frosts.
Ceanothus thyrsifl orusCalifornian Lilac
Dense evergreen shrub providing cover and shelter for wildlife. Bears bright blue fl owers in early summer. Hardy in all but the coldest areas.
Veronica beccabungaBrooklime
Creeping perennial bearing fl eshy stems and leaves. Its rounded leaves can be entire or toothed. Racemes of blue fl owers with a white eye appear in spring/summer. Can only tolerate shallow water, but good for groundcover in wet/semi-aquatic areas.
Chimonanthus praecox 'Luteus'Wintersweet 'Luteus'
Deciduous shrub to 4m with open, clear yellow fl owers.
Chimonanthus praecoxWintersweet
Strong-growing deciduous shrub to 4m with glossy lanceolate leaves to 20cm. Nodding, deliciously fragrant, greenish-yellow fl owers are produced on the bare twigs in winter. The fl owers are often stained purple inside and are up to 2.5cm across.
Erica darleyensisDarley Dale Heath (pictured: cultivar 'Arthur Johnson')
Low-growing shrub with needle-like leaves, bearing fl owers in late winter and spring. Flowers are urn-shaped, usually in shades of pink and form racemes to 10cm long. Many cultivars are available. Alkaline soils may be tolerated.
Hedera helixIvy
Climbing or scrambling plant eventually becoming shrubby. Non-variegated selections have the best chance of producing the nectar-rich fl owers, but these will need at least some sun. Prefers alkaline soils.
Hyssopus offi cinalisHyssop
Dwarf semi-evergreen shrub to 60cm with small, dense, aromatic foliage and spikes of two-lipped, dark blue fl owers from midsummer.
Hamamelis intermediaIntermediate Witch-hazel
Shrub to 4m with upright branches which carry green leaves (to 15cm) that turn yellow in autumn. In winter the bare twigs bear spidery, fragrant fl owers in shades of yellow, orange or red. Various cultivars are available.
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34 LANDSCAPING WITHOUT HARMFUL INVASIVE PLANTS 35A PLANTLIFE / RHS GUIDE
Plants for wildlife Plants for wildlife
Kniphofi a rooperiRooper's Red-hot-poker
Imposing perennial to 1.2m with clumps of broadly linear leaves and impressive, fat heads of red hot poker fl owers in autumn.
Mahonia mediaYellow Lily-of-the-valley Bush
Upright shrub, eventully to 5m, with leathery, hairless, sharp-pointed pinnate leaves to 45cm long and racemes of fragrant yellow fl owers to 35cm long at the ends of the shoots. If planting in full sun requires damp soil.
Ilex altaclarensisHighclere Holly
Evergeen shrubs providing cover and shelter for wildlife, with broad, glossy leaves that are variegated in many cultivars. Female plants bear fruit. May be damaged by hard frosts.
Sedum spectabileButterfl y Stonecrop
Easily propagated, fl eshy perennial with fl at heads of (usually) pink fl owers. For best wildlife value sterile hybrids should be avoided. Neutral, moderately fertile soil is best.
Malus 'Golden Hornet'Crab Apple 'Golden Hornet'
Deciduous tree to 8m with copious, spherical, golden yellow fruit to 2cm across which are carried over a long period. White fl owers are produced in spring.
Sorbus aucupariaRowan
Pinnate-leaved, deciduous tree to 15m with white fl owers in spring which are followed by copious orange-red berries to 8mm across.
Viburnum opulusGuelder-rose
Vigorous shrub to 4m bearing lobed leaves that turn red in autumn. Lacecap fl owers are followed by glossy red fruit. Full sun to part shade in any moderately fertile soil.
Viburnum bodnantenseBodnant Viburnum
Deciduous shrub to 3m bearing toothed leaves to 10cm that have a reddish tinge when young. The highly fragrant, tubular fl owers in shades of pink are borne in clusters at the ends of the branches.
Taxus baccata
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Coniferous evergreen bearing thick, dark needles and, in female plants, red fruit which is eat eaten by birds. Eventually becoming large but easily pruned to size.
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Ilex aquifolium 'J. C. van Tol'Holly 'J.C. van Tol'
Self-fertile tree to 6m with glossy evergreen, fairly spine-free leaves and copious bright red berries.
Late Season
Late Season
Early Season
Early Season
36 LANDSCAPING WITHOUT HARMFUL INVASIVE PLANTS 37A PLANTLIFE / RHS GUIDE
Calluna vulgaris 6
Ligustrum vulgare 6
Prunus spinosa 'Plena' 6
Rhamnus cathartica 6
Ulex europaeus 6
Bergenia cordifolia & hybrids 7
Ceratostigma plumbaginoides 7
Leucothoe fontanesiana 7
Pachysandra terminalis 7
Salix repens var. argentea 7
Sarcococca hookeriana var. humilis 8
Stachys byzantina 8
Colchicum autumnale 8
Colchicum speciosum 8
Crocus bifl orus 8
Crocus chrysanthus 9
Crocus nudifl orus 9
Crocus tommasinianus 9
Cyclamen coum 9
Cyclamen hederifolium 9
Digitalis purpurea 10
Echium vulgare 10
Fritillaria meleagris 10
Narcissus 'Actaea' 10
Scilla siberica 10
Ampelodesmos mauritanica 11
Astelia chathamica 11
Chusquea culeou 11
Fargesia nitida 11
Miscanthus giganteus 11
Phyllostachys nigra 12
Pleioblastus simonii 12
Stipa gigantea 12
Aralia cachemirica 12
Crambe cordifolia 12
Datisca cannabina 13
Eupatorium maculatum Atropurpureum Group 13
Rheum palmatum 13
Rodgersia aesculifolia 13
PLANT PAGE Dry
We
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Mo
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We
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Fert
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Em
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Flo
ati
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Co
ast
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Exp
ose
d
Eve
rgre
en
Fast
gro
win
g
Ha
rdy
CONDITIONS
Veronicastrum virginicum 13
Berberis verruculosa 14
Buxus sempervirens 14
Cornus alba 14
Elaeagnus ebbingei 14
Escallonia macrantha 14
Forsythia intermedia 15
Garrya elliptica 15
Hebe rakaiensis 15
Hebe topiaria 15
Ilex aquifolium 15
Ligustrum lucidum 16
Olearia macrodonta 16
Olearia haastii 16
Photinia fraseri 16
Viburnum opulus 16
Euonymus japonicus & cultivars 17
Abelia grandifl ora 17
Acer palmatum var. dissectum 17
Aucuba japonica 'Crotonifolia' 17
Camellia japonica cultivars 17
Cotinus coggygria 18
Euonymus alatus 18
Euonymus europaeus 'Red Cascade' 18
Hamamelis vernalis 18
Hydrangea macrophylla 18
Hydrangea serrata 19
Nandina domestica 19
Osmanthus burkwoodii 19
Philadelphus coronarius 19
Pieris japonica 19
Sarcococca hookeriana 20
Skimmia japonica 'Nymans' 20
Viburnum betulifolium 20
Viburnum burkwoodii cultivars 20
Actinidia kolomikta 21
Ampelopsis brevipedunculata 21
Ceanothus arboreus 'Trewithen Blue' 21
PLANT PAGE Dry
We
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Mo
ist
We
t
Bo
gg
y
Fert
ile
Po
or
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Flo
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Exp
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Ha
rdy
CONDITIONS
38 LANDSCAPING WITHOUT HARMFUL INVASIVE PLANTS 39A PLANTLIFE / RHS GUIDE
Celastrus orbiculatus 21
Chaenomeles japonica 21
Elaeagnus ebbingei 22
Euonymus fortunei 'Silver Queen' 22
Hedera algeriensis 'Gloire de Marengo' 22
Hedera colchica 'Sulphur Heart' 22
Hydrangea petiolaris 22
Myrtus communis 23
Rosa 'New Dawn' 23
Vitis coignetiae 23
Acer palmatum 23
Arbutus andrachnoides 23
Cercis siliquastrum 24
Crataegus laevigata 'Paul's Scarlet' 24
Crataegus lavalleei 24
Fraxinus angustifolia 'Raywood' 24
Fraxinus ornus 24
Ligustrum lucidum 25
Liquidambar styracifl ua 25
Magnolia grandifl ora 25
Malus 'Golden Hornet' 25
Nyssa sylvatica 25
Parrotia persica 26
Prunus cerasifera 'Pissardii' 26
Sorbus aria 26
Sorbus 'Joseph Rock' 26
Sorbus thibetica 'John Mitchell' 26
Alisma plantago-aquatica 27
Butomus umbellatus 27
Callitriche stagnalis 27
Caltha palustris 27
Canna 'Endeavour' 27
Canna 'Erebus' 28
Canna 'Ra' 28
Carex elata 'Aurea' 28
Ceratophyllum demersum 28
Eleocharis acicularis 28
Fontinalis antipyretica 29
Hosta 'Sum and Substance' 29
PLANT PAGE Dry
We
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Mo
ist
We
t
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or
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Flo
ati
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Co
ast
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Exp
ose
d
Eve
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Fast
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Ha
rdy
CONDITIONS
Hydrocharis morsus-ranae 29
Iris pseudacorus 29
Mentha aquatica 29
Menyanthes trifoliata 30
Myosotis scorpioides 30
Myriophyllum spicatum 30
Myriophyllum verticillatum 30
Nuphar lutea 30
Nymphaea alba 31
Nymphaea hardy hybrids 31
Potamogeton crispus 31
Ranunculus aquatilis 31
Sagittaria sagittifolia 31
Thalia dealbata 32
Veronica beccabunga 32
Buddleja globosa 32
Ceanothus thyrsifl orus 32
Chimonanthus praecox 32
Chimonanthus praecox 'Luteus' 33
Erica darleyensis 33
Hamamelis intermedia 33
Hedera helix 33
Hyssopus offi cinalis 33
Ilex aquifolium 'J. C. van Tol' 34
Ilex altaclarensis 34
Kniphofi a rooperi 34
Mahonia media 34
Malus 'Golden Hornet' 34
Sedum spectabile 35
Sorbus aucuparia 35
Taxus baccata 35
Viburnum opulus 35
Viburnum bodnantense 35
PLANT PAGE Dry
We
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CONDITIONS
Registered Offi ce
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www.plantlife.org.uk
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ISBN: 978-1-907141-34-8
© 2010
Royal Horticultural Society
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