2017‐03‐20

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NEW TREES & SHRUBS FOR YOUR RESIDENTIAL LANDSCAPEPhilip Ronald, Ph.D.

St ic k wi th the tr ied & tr ue?

or

Sif t through the masses of new

cvs?

Change i s necessary

Improved gene t i c s

New pe s t s

Sma l l e r, l owe r ma i n t e nance ya rd s

Remember: marke t i ng does no t a lways lead to a

great p lan t

260 TREE CULT IVARS AT 4 S I TES OVE R 6 YE A RS

200 S HRUB CULT IVARS PLANTED OVE R 4 YE A RS

Introduction

The great pH debate

What’s up with the weather?

Global warming?

BUT

Remember the polar vor tex of 2014?

Cold is st i l l a l imit ing factor

Winter temperatures

No deciduous foliage for

6 months of the year

Consider a tree/shrub’s winter value: form, bark, fruit , buds

Value of evergreens

The Winter Landscape

TREES

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Trees come & go…

Our trees face many abiot ic c hallenges

BUT

The greatest threats are

l iving

General vs specif ic pests

Invasive alien species

Tree challenges

Top-soil often str ipped

Compaction of subsoil

Poor drainage

Minimal water inf i ltration

Lit t le organic matter

Downtown Winnipeg, MB

Same site – 1 year later

Urban soil

Reduced maintenance

desired

Preser ve ornamental

features

ELIMINATE:

Poor crowns

Aggressiveness

Weediness

Fruit drop

Chlorosis

Ussurian Pear

Green Ash volunteersCathedral Elm

Other concerns

MEDIUM & LARGE TREES

Regal Celebration Freeman Maple

Severe dieback on Sienna Glen® Fall colour on September 29, 2017

Red/Silver hybrid, hardy to zone 2, H: 50’ W: 30’

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Inferno Sugar Maple

Sugar maple growing in a yard on Henderson Hwy

H: 40’ W: 30’, oval crown, orange-red fall colour

Wadena, MN

Maple Lake, MN

Lord Selkirk Sugar Maple

Autumn Splendor Hybrid Buckeye

H: 35’ W: 25’, rounded form, panicle flowers, red fall colour, sparse fruiting

Prairie Horizon Manchurian Alder

H: 35’ W: 20’, dark-green foliage, cone-like fruit

Prairie Dream Paper Birch

H: 40’ W: 30’, striking white bark, golden fall colour

Parkland Pillar Asian White Birch

Beige white bark Golden fall colour

Columnar, not resistant to BBB, H: 30’ W: 9’

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Guardian Columnar Aspen

Bronze leaf disease on privacy screen

Seedless, aspen-poplar hybrid, H: 40’ W: 10’

Admiration Hybrid Oak

H: 40’ W: 30’, exfoliating bark, foliage retained in winter

Shooting Star Northern Pin Oak

H: 50’ W: 35’, Bur oak root, scarlet-red fall colour

Russian Mountain Ash

H: 30’ W: 15’, upright oval form, red-purple fall colour

Harvest Gold Mongolian Linden

H: 40’ W: 25’, exfoliating bark, golden fall colour

Triumph Hybrid Elm

Fall colour

DED-resistant, very vigorous grower, H: 60’ W: 40’

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SMALL TREES

SMALL TREES

Nothing else wil l f it !

Less maintenance

Colourful f lowers/fruit

Why small trees?

Hot Wings Tatarian Maple

Outstanding red samaras - July 1 to September 15

H: 23’ W: 20’, “A mid-summer traffic-stopper”

Royal Crown Amur Maple

Outstanding purple-red fall colour H: 20’ W: 15’, alkaline-tolerant

Green Spires Hybrid Caragana

Tough privacy screen Pest-resistant foliage

Seedless hybrid, resists salt and drought, H: 12’ W: 8’

Flowers but no fruit

Flowering Crabapple

Foliar disease resistance is

crucial

SCAB RATINGS:

0%

‘Starlite’

10-20%

‘Gladiator’

Over 50%

‘Spring Snow’ ‘Pink Spires’

‘Thunderchild’

Secrest arboretum - Ohio

‘Starlite’

‘Thunderchild’

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Fruit is an ornamental

feature but can also be messy

Crabapplesshould be:

Small and colourful

Retained through winter

Attractive to birds

Flowering crabapple fruit

‘Starlite’‘Selkirk’

Evolut ion in form

Many older cult ivars were

selected with a spreading

habit

The new trend is towards

upright

‘Thunderchild’ - 1974

‘Selkirk’ - 1967

Flowering crabapple form

‘Gladiator’‘Starlite’

‘Selkirk’‘Thunderchild’

Gladiator Rosybloom Crabapple

H: 20’ W: 9’, upright form

Glossy purple foliage

Purple buds, pink flowers

Starlite Flowering Crabapple

H: 25’ W: 15’, white flowers, upright form Tiny red fruit are retained into winter

Emerald Spire Columnar Crabapple

Heading up gives a fresh look

James Barborinas http://pnwisa.org/2016/12/emerald-spire-flowering-crabapple-malus-x-adstringens-jefgreen/

Retained fruit

Purple Spire Columnar Crabapple

Summer privacy screen with dark purple fall foliage H: 15’ W: 6’, columnar, slow growing, disease-free

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Original tree

Goldspur Amur Cherry

H: 15’ W: 9’, peach-like foliage, golden exfoliating bark

Klondike Amur Cherry

Goldspur

Klondike

Seedling of Goldspur, vigorous grower, H: 25’ W: 15’

Ivory Pillar Tree Lilac

H: 23’ W: 16’, upright form, large panicles

Technito Skybound Pyramidal Cedar

H: 18’ W: 4’

Year-round privacy screen

Developed in Manitoba

Resis tant to winter browning

Dense whor led fol iage also

res is ts splaying

Nannyberry Viburnum Tree-form

Spring flower clusters

Fall fruit attracts birds

H: 18’ W: 9’, strong tree-form

NEW SHRUBSNEW SHRUBS

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Low Scape Aronia

Customer preference for low-maintenance, compact shrubs

> fill small spaces> no pruning required> less winter damage

‘Low Scape’ ‘Viking’

Concorde Barberry

‘Concorde’

September 29/16

‘Emerald Carousel’

November 9/16

Compact & colourfu l

Heat to lerant

Drought to lerant

‘Concorde’H: 2 ’ W: 2-3 ’

Mounded shape

Deep pu rp le summer fo l iage

Red fa l l co lou r

‘Sensat ion’H: 3 ’ W: 3-4 ’

T idy ba l l s hape

Exce l l en t con t ra s t p lan t

‘Concorde’ – fall colour

‘Sensation’

Little Rebel Tatarian Dogwood

Fall colour

Winter stem colour

Dwarf dogwood with bright red stems, H: 3-4’ W: 3-4’

Cool Splash Bush Honeysuckle

Variegated foliage, light-yellow flowers, H: 3-4’ W: 3-4’

Silverado Hybrid Olive

Original plant, Bismarck, N.D.

Sterile hybrid, tolerant to salt and drought, H: 10’ W: 10’

Since 2000, over 90

hydrangeas patented

Abundant introducers

Limited test ing

Remember, new is not always

improved!

The latest on Hydrangeas

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‘Annabelle’ , the standard for comparison

Flowers occur in dome-shaped

inflorescences (corymbs)

Dirr : “st i l l the best white mophead”

Smooth Hydrangea

Pure-white flower heads in July, H: 3-4’ W: 3-4’

Incrediballseries

‘ Incredibal l ’

‘ Incredibal l B lush ’

Invincibelleseries

‘ IV L imetta’

‘ IV Min i Mauvet te’

‘ IV Ruby’

‘ IV Spir i t I I ’(3-4’)

‘ IV Wee White’(1-2’)

‘IV Wee White’

‘IV Spirit II’

‘IV Limetta’

‘Incrediball Blush’

‘Invincibelle Ruby’

Smooth Hydrangea cultivars

Panicle Hydrangea

‘Diamond Rouge’

‘Fire Light’

‘Limelight’ - tree

20+ cult ivars in the

marketplace

Red flowered cult ivar = “holy

grail”

‘D iamond Rouge’H: 4-5’ W: 3-4’

‘F i re L ight ’H : 5-6’ W: 4-5’

Tree-forms sell ing well;

concerns about hardiness in

zone 3

Bloom time is more impor tant

the fur ther nor th you go!

Choose ear ly bloomers –

July 20:

‘Quick Fire’

‘L i l ’ Quick Fire’

‘Bobo’

‘L it t le Lamb’

‘Pinky Winky’

July 31, 2008

September 29, 2008

Hydrangea bloom time

‘Quick Fire’ ‘Limelight’

Compact panicle hydrangeas

‘Little Quick Fire’ – H: 3-4’ W: 3-4’‘Bobo’ – H: 2.5-3’ W: 3-4’

‘Little Lime’ – H: 3-4’ W: 3-4’

BoltingThe most

s ignif icant shrub genus in zone 3

Vigorous and tolerant

Issue of bolt ing

True dwarfs avai lable

Tree-forms showcase bark but have the problem of

basal sprouts

‘Little Devil’

The latest on Ninebarks

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Amber Jubilee Ninebark

Orange yellow spring foliage, H: 5’ W: 5’ Fall foliage

Festivus Gold Ninebark

‘Dart’s Gold’

Dwarf version of Dart’s Gold, H: 3’ W: 4’

‘Lemon Candy’

The search for truly dwarf ninebarks (3-4’) rather than the standard (6-8’)

‘Festivus Gold’

Tiny Wine Ninebark

Smallest purple ninebark, dense with fine texture, H: 4’ W: 4’

‘Diabolo’

‘Summer Wine’

‘Center Glow’

The search for truly dwarf ninebarks (3-4’) rather than the standard (6-8’)

‘Tiny Wine’

Mandarin Tango Potentilla

‘Orange Whisper’‘Mango Tango’

‘Mandarin Tango’

‘Mandarin Tango’

Dwarf shrub with orange-red flowers, H: 2’ W: 2’

Morden Golden Glow Elder

Morden Research Station introduction, H: 4’ W: 4’

Compact , fu l l sun plant

Impressed wi th :

‘P ink Parasols ’

H : 2-3’ W: 3-4’

Wakes up ear ly

F luffy pink f lowers

Newer cu l t ivars :

F IRST EDIT IONS

‘Pink Sparkler ’

PROVEN WINNERS

‘Double P lay Red’

‘Pink Parasols’ in Portage

June 15/16 - 3 years post-plant

‘Pink Sparkler’ ‘Double Play Red’

Outstanding Spirea

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Little Lady Hybrid Lilac

‘Little Lady’

‘Miss Kim’

Hybrid between Miss Kim and Dwarf Korean lilac, dense compact habit, H: 4’ W: 4’

‘Bloomerang Dark Purple’ - reblooming

Tiger Eyes Staghorn Sumac

H: 6’ W: 6’, a “must have”, soil tolerant, Summer: contrast with purple accents, Fall colour: orange, red

May 16, 2015 – 1 year post-plant

June 15, 2016 – 2 years post-plant

Spilled Wine Weigela

Purple foliage, pink spring flowers, H: 2-3’ W: 3-4’

Canadian Shield Rose

H: 4’ W: 3’ – very floriferous

40 petals, excellent disease resistance

The colours of Canada

Canadian Shield

Oscar Peterson

Never Alone Rose

30+ blooms on 2 gal

Great on the patio

2” deep red/white flowers, H: 2’ W: 2’

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BERRIES ARE ALL THE

RAGE

Plants that combine

esthetic and nutr it ional

value

Flowers and fruit

Ser viceberry

Blueberry

Currant

Nanking c herry

Edible Ornamentals

Very unique, healthy fruit

Compact plants

Alkal i- tolerant

Frost-tolerant in bloom

Breeding: increasing fruit

s ize

Haskap - Honeyberry

Passion Series Tart Cherry

University of Saskatchewan

Zone 2

White spring flowers

Self-poll inated

Red fleshy fruit , picks

clean

Bluebell & Louise Swenson Grape

A fruitful fence

‘Louise Swenson’

‘Bluebell’

THANKS FOR LISTENINGANY QUESTIONS?