vegetable gardening · what is a fruit? • botanically speaking: –ripened ovary containing seed...
TRANSCRIPT
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Vegetable Gardening
Danny Byrum
March 18, 2013
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What is a Vegetable?
• Most definitions are based on usage and
are not botanically based
– A herbaceous plant, or portion of a plant, that
is eaten raw or cooked, generally with an
entrée or in a salad, but not for dessert
– Exceptions: Rhubarb & melons
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What is a fruit?
• Botanically speaking:
– Ripened ovary containing seed together with
adjacent part that are eaten at maturity
– Exceptions: Tomato, beans, etc…
• Usage Definition:
– Sweet & edible plant structure consisting of a
fruit (botanical) or false fruit that is eaten raw
or as a dessert
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Vegetable Classification
Who belongs where???
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Alliaceace: Amaryllis Family
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Poaceae: Grass Family
www2.dpi.qld.gov.au/images/13389.jpg
http://extension.missouri.edu/xplor/agguides/hort/g06390.htm
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Liliaceae: Lily Family
http://www.ext.vt.edu/pubs/vegetables/438-102/438-102.html
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Brassicaceae: Mustard Family
www.muranakafarm.com/img/inside_products_k
ale.jpg
www.veggiegardeningtips.com/wp-
content/upload...
www.dkimages.com/.../previews/883/20104
689.JPG
www.seedfest.co.uk/seeds/radish/radi
sh_easter.jpg
www.hort.purdue.edu/.../im
ages/large/turnip2.jpg
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Cucurbitaceae: Gourd Family
www.aftonapple.com/pumpkins.jpg
http://foodpac.gatech.edu/_foodchain/foodchain_7-5.htm
http://vric.ucdavis.edu/selectnewcrop.cucumber.htm
http://www.ipmcenters.org/cropprofiles/docs/NJsq
uash.html
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Fabaceae: Bean/Pea Family
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Solanaceae: Potato/Nightshade Family
www.avrdc.org/LC/tomato/producti
on/01title.jpg
www.avrdc.org/.../eproduction/titlepix.jpg
www.gardenaction.co.uk/images/pota
to_wilja.jpg
www.avrdc.org/LC/pepper/swtprod/03int1B.jpg
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Before you begin, ask yourself the
following:
• Who will be doing the work?
– Alone=keep it small
• What do you & your family like?
– Don’t want to plant veggies you won’t eat
• How do you plan to use the produce?
– Fresh vs. storing
• How much space is available?
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Where should you put your
garden?
Its all about location, location, location!
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• Suitable soil: loose, well-drained
• Water supply reasonably close by
• Shade
• Crop rotation
• Avoid planting near trees & shrubs
• Gardening where sod has been long
established
Points to consider:
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Soil Preparation
• Ideal soil is deep, friable, well-drained, and
has high organic matter
• Chances are, this is not the case
• Soil amendments may be necessary, but
FIRST & FOREMOST…
SOIL TEST!!!!
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Soil Testing
• In-state testing $10.00 (basic) through Virginia
Tech Soils Testing Lab (www.soiltest.vt.edu)
• Recommended every 3 years
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Soil Amendments
• Any addition to the soil that improves its
physical or chemical condition
• Can be used to adjust pH, increase
nutrients, and improve soil structure
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pH
• Ideal pH for vegetable production is 6.2-6.8
• Raise pH (make more basic)
– Dolomitic limestone
– Adds calcium and magnesium
– Wood ashes
• Lower pH (make more acidic)
– Agricultural sulfur
• It is important to add the correct amount, which is why your soil test is so important
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Adding Nutrients (Fertilizing)
• Synthetic vs. organic
• Macronutrients
– Nutrients the plants need in large amounts
– N-P-K (10-10-10)
• Micronutrients
– Nutrients the plants need in small amounts
– Equally important
– Magnesium, calcium, boron, etc…
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Improving Soil Structure
• Organic matter is a great way to improve soil structure
– Manures, leafmold, sawdust, straw, & many others
• Undecomposed materials & nitrogen
• Compost
• Animal manures
– Apply in fall & allow to
decompose until next spring http://www.cambridgema.gov/TheWorks
/departments/recycle/basics.html
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Cover Crops
• Any crop grown primarily to protect,
maintain, or enrich the soil
• Term first used during the 20th century
“Dust Bowl”
• Growers soon realized the benefits of
cover cropping
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Cover Crop Categories
• Green manure: cover crop is tilled into the
topsoil to add organic matter and feed the soil
life
• Smother crop: cover crop grown in order to
suppress or choke out weeds
• Catch crop: planted after harvest of a heavily-
fertilized cash crop to soak-up and conserve
leftover mineral N and other soluble nutrients
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Cover crop benefits on Soil Health
• Replenish soil organic matter (SOM)
• Feed and support soil life
• Fix atmospheric N into plant-available N
• Make other nutrients more available,
especially phosphorus (P)
• Help maintain nutrient balances in soil
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Benefits on Physical Properties of
Soils
• Protect from wind and
water erosion
• Protect from compaction
• Enhance soil tilth (crumb
texture), aeration,
drainage, and moisture
holding capacity
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Other Benefits
• Weed suppression
• Enhance crop diversity, reducing pest and
disease problems
• Provide habitat and food for beneficial
insects
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Soil Benefits
• Donate about 10% of photosynthetic product
into soil as root exudates
• Stimulate and nourish beneficial
microorganisms
• Leguminous cover crops can fix atmospheric
N and convert into plant-available nitrogen
• If too much N available in soil, a heavy-
feeding crop can capture the N to prevent
leaching and groundwater pollution
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Erosion and Compaction
• Partial coverage from a cover crop can greatly reduce wind and water erosion
• Protect from drying effects of sun and compacting effects of rainfall, which can lead to a “dead zone”
• Deep rooted cover crops can act a “bio-plow” to break up hardpans caused from mold-board plowing
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http://www.ipm.iastate.edu/ipm/icm/2007/5-7/wetsoil.html
http://blog.calciumproducts.com/index.cfm?category=5
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Weed Suppression
• Competition
– A good standing cover crop can cover the soil
in about 2-3 weeks
– Puts emerging weeds in the shade and
chokes them out
• Allelopathy
– Chemical interaction between cover crop and
weed species
– Acts as a pre-emergent herbicide
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Beneficial Insect Habitat
• Many crops have blooms that house important nectaries for beneficial insect species
• If cover crops left in strips throughout the field, will attract many species of beneficial insects
• Farmscaping
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Planting Cover Crops
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Tilling the Soil
• Rototilling
– Sufficient for most gardeners
– Mixed the upper layers of soil rather than completely turning the soil over
• Advantages of fall tilling
– Earlier spring planting
– Better decomposition of O.M.
– Potentially reduce weeds, insects, & diseases
– Will still need to be worked before spring planting
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www.constructioncomplete.com/cc/images/items/...
http://lawn-aerator-attachment.com/
http://www.amazing-atv-machinery.com/atv-
rototiller-agrifab-products.html
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Equipment
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Seeds
• Take care to purchase
seed from a reputable
seed source
• Keep notes on
germination qualities,
vigor of plants,
tendencies toward
insects & disease, etc…
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Saving Seeds
• Save only from open-pollinated varieties
• Hybrid seeds will not produce true-to-type
• Seed-borne diseases
• Cross-pollination
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Storing Seeds
• Properly stored seeds will remain viable
for different periods of time
• If seeds were purchased, be aware that
the seed company could have saved them
for years before selling
• Store in air-tight containers in a cool, dark
location
• Be sure to label with the name and
package date
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Starting Seeds Indoors
• Make sure you have enough light
– If you don’t have a sunny room, you may
need supplemental light
• Use a soilless or peat-lite mix to start
seedlings
• Start in some type of tray and when
seedling have 1 or 2 sets of true leaves,
transplant into larger pots
• Peat pots
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http://www.novoselenterprises.com/products/jiffy.asp
http://commons.wikimedia.org/wiki/Image:See
dling_cotyledons_small.jpg
http://progressivegardening.com/pottingmi
xalternatives.html
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Direct Seeding
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Transplanting
• Stocky, healthy, disease-free, and have good
roots
• Hardened-off
• Transplant on a shady day, in late afternoon, or
in early evening to prevent wilting
• Set plants slightly deeper than previously
planted
– Tomatoes are the exception to this rule
– Water the plants 2x daily, if there isn’t sufficient
rainfall
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Irrigation
• Critical to successful vegetable gardening,
especially in our area
• A healthy plant is composed of 75-90%
water
• Vegetables need 1 inch of water per week
– Helpful to have a rain gauge near the garden
– If rainfall not adequate, will have to
supplement with irrigation
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Trickle Irrigation
• Much more efficient in use of water
– Utilizes more frequent or continuous
application of water in smaller amounts to
prevent dryness
• Systems available in many lawn & garden
stores
• May want to purchase from irrigation
company
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http://www.rittenhouse.ca/asp/product.asp?PG=1655
http://www.berryhilldrip.com/ http://www.berryhilldrip.com/
http://www.berryhilldrip.com/
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Reducing Water Demands
• Organic matter will improve the moisture-
holding capacity of the soil
• Mulching
– Prevents evaporative losses
• Know the critical watering periods of the
plants in your garden
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Crop Critical watering periods
Asparagus Spear production, fern development
Beans Pod filling
Broccoli Head development
Cabbage Head development
Carrot Seed emergence, root development
Cauliflower Head development
Sweet Corn Silking, tasseling, ear development
Cucumber Flowering, fruit development
Eggplant Flowering, fruiting
Lettuce Head development,
Melons Flowering, fruit development
Peas Pod filling
Tomato Flowering, fruiting
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Benefits of Irrigation Practices
• Aid in seed emergence
• Reduce soil crusting
• Improve germination & plant stand
• Reduce wilting and checking of growth in transplants
• Increase fruit size of tomato, cucumber, & melon
• Maintain uniform growth
• Improve the quality and yields of most crops
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Weeds
• Plants out of place
• Weed seeds may remain viable for seven years or more when conditions are not right for their growth
• When you work the garden for vegetables, you are creating an ideal environment for their growth
• Problems with weeds
– Shading, competition for water & nutrients, harboring insect & disease
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Control Methods
• Cultivation
• Mulching
• Close spacing
• Cover crops
• Herbicides
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How much to plant?
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Choosing Vegetable Varieties
• Many different varieties of each crop to
choose from
• Selection will be based on personal
preferences
• Seed catalogs vs. garden supply store
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Tomatoes
• Transplants
• Spacing: 18-36” x 36” if staked or
caged
• Fertilizer: sidedress 1-2 wks after
1st cluster begins to develop; then
again when 2 wks after 1st ripe
tomato; repeat in 1 month
• Determinate vs. Indeterminate
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‘Brandywine’
‘Cherokee purple’
‘Crista’ ‘Better boy’
‘Juliet’
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Peppers
• Transplants
• Spacing: 18-24” x 30-36”
• Fertilizer: sidedress after 1st fruit sets; too
much will cause excessive vegetative
growth
• Bell peppers: green=immature; red,
orange, yellow, etc…= mature
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• Planting: Seed after danger of frost has passed
• Spacing: 9-12” by 4-36”: want minimum of 3 rows (preferably 4) for pollination
• Hardiness: Tender annual
• Fertilizer needs: heavy feeder; preplant broadcast (4 lbs of 5-10-10/100 ft2 row); sidedress when plants are 8-10” high & when tassels begin to form (1 lb 5-10-10/100 ft2 row)
Sweet Corn (Culture)
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Sweet Corn
• Light: sunny
• Soil: deep, well-
drained loam
• Fertility: rich
• pH: 6.0-7.0
• Temp.: Warm (60-
75° F)
• Moisture: average
(Environmental Preferences)
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Cultural Practices for Sweet Corn
• Continuous harvest
• Super-sweet (Sh),
sugary enhanced (Se),
Normal (Su)
• Mulching
• Harvest
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Standard sugar
(su)
Sugar enhanced
(se)
Super sweet
(sh2)
Su
O.K.
O.K.
Starchy
Se
O.K.
O.K.
Starchy
Sh2
Starchy
Starchy
O.K.
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‘Maple Sugar’
‘Silver Queen’
‘Serendipity’
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Insect Pests of Sweet Corn
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Insect Pests of Sweet Corn
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Corn Diseases
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Cultural Problems with Sweet Corn
• Poor kernel development: not filled to tip
• Dry weather during silking
• Planting too close
• Poor fertility (K+ deficiency)
• Poor pollination caused by insufficient number
of rows
• Lodging: falling over
• Excess nitrogen
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Muskmelon (a.k.a. cantaloupe)
• Transplants or direct seeded
• Spacing: 6-8’ between hills, 7’ apart
• Fertilizer: be careful not to give too much
nitrogen, as this may adversely fruit quality
• Be careful with excessive moisture; may
cause splitting or rotting on bottom of fruit
• When ripe, the fruit will ‘slip’ easily from the
vine
• Pollination is dependent on bees
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‘Ambrosia’
‘Athena’
‘Sun Jewel’
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Watermelons
• Transplant or direct seed
• Spacing: 2-3’ between hills; 5-7’ apart
• Fertilizer: same as cantaloupe
• Again, need to be careful with excessive moisture
• Harvest when: 1. the curl closest to the melon begins to dry, 2. the bottom of the melon turns from white to yellow
• Pollination dependent on bees
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‘Charleston Gray’
‘Crimson sweet’
‘Sugar baby’
‘Sunshine’
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Cucumber
• Transplant or direct seed
• Spacing: depends on cultural method; see MG
guide
• Fertilizer: sidedress 1 wk after blossoming and
again 3 wks later
• Harvest: personal preference, but want to pick
before they start to turn yellow; if seeded variety,
seeds grow with the cucumber
• Pollination may or may not depend on bees,
depending on type
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‘Picklebush’ ‘Lemon’
‘Sweet Success’
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Summer Squash
• Transplant or direct seed
• Spacing: 3-4’ x 4-6’; 2-3 plants per hill
• Spacing can be decreased if planted as
singles
• Fertilizer: sidedress 1 wk after
blossoming; repeat 3 wks later
• Harvest: pick before fruit is too old; take
old fruit off so new ones will develop
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‘Sweet Zuke’
‘Zephyr’
‘Gentry’
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Potatoes
• Seed pieces with one good eye (Mar. 15-Apr. 20th)
• Spacing: 10-12” x 24-36”
• Fertilizer: high phosphorus fertilizer before planting; sidedress 1-2 times after tubers begin forming
• Harvest: Dig early potatoes when large enough to eat
• Storing: two weeks after light frost; avoid freezing
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‘Swedish peanut’
‘Red pontiac’ ‘Adirondack red’ ‘Adirondack blue’
‘Russian banana’ ‘Kennebec’
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Intensive Gardening
• Intensive versus traditional gardens
• TG are long single rows of vegetables
• IG reduces wasted space so that you
can harvest as much produce as
possible from a given space
• With IG, you concentrate work efforts to
create an ideal plant environment, giving
better yields with less labor
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Intensive Ideal
• Have something growing in every part of
the garden at all times during the growing
season
• Continuous garden
• May not be for everyone
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The Raised Bed
• Basic unit
• Frames versus no
frames
• Good soil (hold
water and
nutrients) = less
competition within
garden
• Plant spacing
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Plot 1 Plot 2
Plot 4 Plot 3
8’
8’
Grass Strip
21” wide
Grass Strip
21” wide
(Rotation)
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Vertical Gardening
• Trellises, nets, strings, cages, poles
• Ideal plants are vining and sprawling
plants
• Shadows
• Water requirements
• Soil
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Interplanting
• Growing 2 or more types of vegetables in same space at same time
• Must take these factors into account:
• Length of growth periods
• Growth pattern
• Negative effects on other plants?
• Season
• Light, nutrient, & water requirements
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Wide Row Planting
• Distance from one plant to all other plants
around it is the same distance
• With more than one row, means plants
need to be staggered
• Results in an efficient use of space with
less area to weed and mulch
• Plant canopy eventually shades all areas
of soil to help conserve water
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Succession & Relay Planting
• When one crop is finished, plant something
new in its place
• Making the most of your IG
• Disease and insects
• Relaying: overlap plantings of one type of
crop
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Container Gardening
• Limited space
• Soil-borne diseases, nematodes, or poor soil
• Grow vegetables that take up little space or bear over a long period of time:
• Root vegetables (carrots, radishes)
• Lettuce
• Tomatoes & peppers
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What type of container do I need?
• For vegetables, must be:
• Big enough to support plants when fully grown
• Hold soil without spilling
• Adequate drainage
• Never held toxic products
• Deep enough to hold right amount of soil for
adequate root growth
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Media for Container Gardens
• Need a lightweight potting mix
• Don’t use soil from your yard or garden
• Soilless mixes are generally too
lightweight
• Recipe for making own soil:
• 1 part peat moss, 1 part garden loam, 1 part
clean, coarse sand (perlite), & slow-release
fertilizer
• Soil Test
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Watering & Fertilizing Containers
• Containers versus in-ground gardens
• Fertilizer in soil mix
• Frequency
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Indoor Container Vegetables
• Cherry/grape tomatoes, peppers,
lettuce, herbs
• Avoid overwatering
• Humidity requirements
• Lighting
• Indoor pests