When To Plant Vegetables In The Edmonton Region [Planting Chart]

We have put together a list of recommended dates for various vegetable crops that we have used over the years when the Wallishes were market gardeners.  Please remember that these are guidelines and not guarantees because there is little about our weather that is predictable.

Planting Vegetables in Edmonton

Knowing when and how to get your veggie garden up and going can be daunting – we’ve put this updated new and improved veggie timing chart together for you.  To make this chart better we’ve added:

  • More specific information for seeding – whether indoors or outdoors
  • Which plants are best to get a jump start on – to seed indoors or to buy transplants
  • Common pests and diseases to watch out for
  • Common companions
  • Gardening Tips specific to each vegetable

Seeding Vegetables in May

By the 2nd week of May IF the garden is dry and soil is warming,  you can seed:

Peas, sweet peas and potatoes are hardy enough to weather a little frost and peas relish the cool mornings and evening.

Cole crops such as broccoli, Brussels sprouts, cabbage, cauliflower, kale, kohlrabi are safe to seed once the garden soil has warmed up and there’s been  no frost for 3-4 days, the seeds will likely be ok, and can tolerate a little bit of frost.

Crops that need to be sown early are those that have a long maturation time, specifically corn.  Corn is a tender crop that loves the heat but its maturation requirement is quite long.  To battle that, we have to sow it early but if corn stalks are under 4-5” tall, they can withstand a light to moderate frost and continue to grow. A window for sowing corn is by about the 2nd week, maximum the 3rd week of May.

Avoid seeding tender veggies at this early time. Wind chill will even give beans, cucumbers, pumpkin, squash, zucchini, peppers, celery, tomatoes, radishes, lettuce, spinach, and herbs wind burn:

The above have a relatively short maturation time and are safe to sow by the 4th week of May and even into June. A strategy for short crops like lettuce and spinach is that you can sow them in succession, like sow a little every 2 weeks so that you can have a continual supply of these fresh greens.

Related: 9+ Vegetables That Should Be Started Indoors

Vegetable Planting Charts

Here are two handy vegetable timing charts:

veggie chart


          Vegetable Timing Chart 2.0


“Blight” Potato and tomato blight is a disease of the foliage and fruit or tubers of tomatoes and potatoes, causing rotting.

It is most common in wet weather.

Importance of well drained soil with good organic content.  Stay out of wet gardens to avoid plant to plant transfer.

Look for disease resistant varieties.

Cut Worms Cranky garden pest with a broad appetite – cuts off tender plants at / near soil level usually at night.

Cool weather – just below ground level.  Warm weather – just above ground level.

Dig them out of the soil, place collars around stems.

Till garden in spring and fall. Keep garden clean of weeds and plant debris.

Slugs Slugs love cool ground → place wood ashes, sand, lime (slugs will not cross over them)

– saucers of stale beer, slug baits

  ** please remember that dates in chart are approximate ALWAYS depending on weather **
Crop Timing Tips Common Pathogens/ Pests Companions
Beans Seed after May 24 because of frost sensitivity Bush & Climbing types


Garlic, Onion, Shallots ↓ bean growth

Generally unaffected Beet – bush beans

Carrot, Cole crops, Corn,  Cucumber, Peas

Cole Crops

(Broccoli, Cabbage, Cauliflower, Kale, Kohlrabi etc)

– Transplants recommended to put in garden as early as the 3rd week May


– start seeds indoors the 3rd week of April

Cool weather crop

Mulching is very beneficial

Butterflies / Worms→ Bacillis Thuringiensis (BT) very effective

– Nasturtiums (trap crop) at opposite end of garden – cabbage butterflies like Nasturtiums better = effective even in small gardens

– rye flour

– rotating crop (larvae winter over in the ground)

Hate: tomatoes ↓ cole growth, strawberries, pole beans


Like: carrots, onions, beets,

Garlic improves flavor

Rosemary, Sage, Mint deter cabbage moth

Corn Seed Early → Long crop – seed May 5-14 depending on weather

If there is heavy frost at < 5” tall, corn will be okay

> 5” will frost will kill corn

Seed 3-4” apart in 40” row

Seed 6” apart in 20” row

Plant in blocks for cross pollination

Heavy feeder (likes Nitrogen)

Heavy water consumer

Highest sugar content in morning – pick & cool immediately


Few pests or diseases generally


Beans & Peas

(nitrogen fixers from air into the soil)




Cucumbers – Transplants recommended  — or seed later, May 18-24, because of cold sensitivity

– Start seeds indoors 1st -2nd week of May

Love heat and warm feet (cover soil with black poly x 2 weeks before seeding)

Don’t like roots disturbed

Consistent moisture to prevents bitterness

Greenhouse culture – Support / trellis

Heavy drinker (water) / Heavy feeder

Yellow skin = over ripe

Few pests or diseases generally


Nasturtiums & Marigold deter pests

Hate pumpkins, squash, sage, Zucchini – will not produce

Like beans, cole

Marigolds deter beetles

Lettuce  -Seed / or transplants 4th week May

– Start seeds indoors 1st -2nd week of May

Try successive plantings every 2 weeks

Bolting is due to heat stress

Keep evenly watered

Rabbits & Rodents & Deer

Occasionally aphids

Garlic, Onions

Radishes, Carrots

Chives deter aphids

Onions – Transplants  or sets around the 3rd week May We prefer transplants over onion sets

Red onions store well

Ready to harvest when necks fall over

Field cure alternatively until tops are dry

Onion Maggots – aggressive

‘subterranean chainsaws’ (Ken Beattie)do much damage with onions planted in rows → plant in random clumps throughout garden

beets, carrots, cole crops, lettuce, parsnips, peppers, potatoes, tomato
Peas Seed as early last week April to 2nd week of May  – can take cold weather


Supports/Trellises if you wish

Seed thickly (2” apart)

Powdery mildew – esp. later in the year due to wet conditions → look for mildew free peas

rotate crop

beans, beets, carrots, celery, cole crops, corn, cucumbers, lettuce, potatoes, radishes, squash, sage, turnips
Peppers – Transplants recommended

May 24

– Start seeds the 2nd – 3rd week of April

Love heat

Love Greenhouse culture

Black plastic mulch or organic mulch keep roots warm

Temperature variation encourages better blooms & fruit setting

All green peppers turn red

Grown inside a greenhouse – aphids basil, carrots, coriander, onions, spinach, tomatoes
Potatoes – Start seed potatoes the 2nd – 3rd week of April Try successive plantings every 2 weeks

Try new colored varieties (ie Russian Blue)

Potatoes & Tomatoes are attacked by the same blight therefore avoid planting close together

– Potato bug

– Potato Scab d/t alkaline soil (ph > 7.5) treat soil w/ compost / peat moss, increase organic content, avoid manures

– Potato Blight – wet weather

Companions: Beans, Peas, Corn.

Allies:  Marigolds – deters beetles

Horseradish – generally protects

Tomatoes – Transplants recommended

May 24

Love heat – warm soil 2 weeks before planting – speeds maturation

– mulch – stone mulch warms soil, deters fungal infections

Needs warmth to set blossom

Up against house / Greenhouse culture

Heavy drinker – consistent moisture at all times

Heavy feeder – commercial tomato fertilizer 4-12-4, 5-20-5 weekly

Spindly tall tomato – plant deeply or in a trench

Blossom end rot – due to stress: calcium deficiency or watering inconsistency or too dry, and cold nights

– have good air circulation

– don’t water at night


Basil – best garden buddy

asparagus, carrots, celery, chives, oregano, onion, parsley, rosemary, strawberry



Veggies that share common problems: peppers, eggplant, okra, potatoes

Happy gardening and enjoy those fresh veggies!

We welcome you to send in any questions you have via email and encourage you to come into the greenhouse this spring for seeds and started veggies in our vegetable department.  We’d be delighted to help you choose fun and tasty varieties to try this growing season.