It's a common misconception that once June is over, the planting window has closed. In Manitoba, mid-summer still gives you a solid 10–12 weeks before the first hard frost — typically hitting the West St. Paul and Winnipeg area around mid- to late September. That's a meaningful growing window, and there's plenty you can get in the ground right now.
The key is matching what you plant to the time remaining. Fast-maturing crops and heat-loving annuals thrive with a July start. Perennials and woody plants established now will spend the rest of the season building root systems so they're ready to perform fully next spring.
Vegetables — There's Still Time
Leafy Greens and Salad Crops
Lettuce, spinach, arugula, and kale are ideal July plantings in Manitoba because they actually prefer cooling temperatures — and by the time they mature in August and September, the worst summer heat has passed. Direct-sow seeds now and expect harvests in 30–45 days. You can extend the season further with a simple row cover when frost threatens.
Radishes and Beets
Radishes are one of the fastest crops in the garden — some varieties are ready in as little as 25 days. Beets take 50–70 days but are cold-tolerant and will sweeten up nicely as fall temperatures drop. Both are excellent candidates for a mid-July sowing.
Bush Beans
Bush beans mature in 50–60 days and can handle a July planting if you get them in by mid-month. They need warm soil to germinate well, which July provides in abundance. Skip pole beans — they take too long for a late start.
Green Onions and Peas
Green onions (scallions) mature in about 60 days and handle light frosts without issue. Peas can go in for a fall crop — they actually prefer cool weather at both ends of the season. Sow by mid-July for September harvest.
Annual Flowers — Still Plenty of Season Left
Marigolds
French marigolds grown from transplants will bloom right through until frost, giving you 8–10 weeks of colour. They're one of the best companion plants in the vegetable garden and nearly impossible to kill in a Manitoba summer.
Zinnias
Zinnias love heat and direct sun — conditions July delivers in full. From transplant, you'll have blooms in 6–8 weeks. They make excellent cut flowers and attract pollinators through to frost. One of the best investments for late-summer colour.
Cosmos and Nasturtiums
Both are fast-growing annuals that can be direct-sown from seed in July. Cosmos can reach 4 feet tall and bloom prolifically with minimal care. Nasturtiums fill in quickly along borders and are edible — flowers and leaves both have a peppery bite.
Perennials and Shrubs
Potted Perennials
Planting a potted perennial in July is perfectly reasonable — in fact, many gardeners prefer it because the plants at the garden centre have been growing all season and are large, healthy, and easy to establish. Water deeply every 2–3 days for the first month, and they'll be well-rooted before freeze-up. By next spring they'll perform like established plants.
Good July choices include: coneflowers (Echinacea), black-eyed Susan (Rudbeckia), daylilies, hostas for shaded spots, and ornamental grasses. All are hardy Zone 3–4 performers and widely available at local garden centres.
Hardy Shrubs
Potted shrubs can absolutely go in the ground in July — the soil is warm, which actually speeds up root establishment compared to a cold spring planting. The critical factor is water: plan to irrigate consistently through August. Spirea, potentilla, ninebark, and dwarf lilac are all excellent choices that establish well from a mid-summer planting.
What to Skip Planting in July
Some crops simply don't have enough season left. Avoid planting: tomatoes, peppers, squash, or melons from seed (transplants would have gone in by early June). Garlic is planted in fall. Long-season root vegetables like parsnips or main-crop carrots need more time than July allows.
Tips for July Planting Success
- Water more, not less: July heat means newly planted material dries out fast. Deep watering every 2–3 days beats shallow daily watering — it trains roots to go deep.
- Mulch immediately: A 2–3 inch layer of mulch around new plantings dramatically reduces soil moisture loss and moderates temperature spikes. We carry mulch and topsoil for delivery if you need it.
- Plant in the evening: Transplanting in the morning means the plant sits in full sun immediately. Evening planting gives it a full night of cooler conditions to settle before it faces the heat.
- Water transplants in: Pour water directly into the planting hole before setting the plant, and water again after filling. Eliminate air pockets at the root zone.
- Don't fertilize heavily right away: A transplant's first job is root establishment, not top growth. Hold off on heavy fertilizing for the first two weeks.
What We Carry This Time of Year
Our greenhouse and garden centre stocks a selection of vegetable transplants, annual flowers, and potted perennials well into summer. Stop in at 4240 Main Street in West St. Paul to see what's currently available, or contact us with questions. We also carry topsoil, compost, and mulch for delivery to help new plantings get established.
The season isn't over — you've still got time. Get planting.