Minnesota summers demand flowers that can handle intense sun and occasional heavy rain while blooming continuously. If you’re searching for the best flowers to grow in minnesota summer, you need varieties that thrive in our short but intense growing season. This guide covers top picks for full sun, partial shade, and even wet spots.
Northern gardeners face unique challenges: cold nights, humid days, and unpredictable storms. But with the right choices, your garden can stay colorful from June through September. Let’s dig into the flowers that actually perform well here.
Understanding Minnesota’s Summer Climate
Our summers are hot and humid, especially in July and August. But we also get sudden downpours and cool evenings. This means plants need strong roots and disease resistance.
Most annuals and perennials sold at local nurseries are already tested for our zone. But not all “sun-loving” flowers can handle 90°F with 80% humidity. Stick to proven performers.
Key Factors For Flower Selection
- Heat tolerance: Can it handle 90°F+ days?
- Rain resistance: Does it rot easily in wet soil?
- Bloom duration: Does it flower all summer or just a few weeks?
- Cold hardiness: Can it survive early fall frosts?
Best Flowers To Grow In Minnesota Summer
These flowers are tried-and-true for our climate. They laugh at heat, shrug off rain, and keep blooming until frost.
1. Coneflower (Echinacea)
Coneflowers are Minnesota natives. They love full sun and tolerate drought once established. The purple petals and orange centers attract butterflies and bees.
Plant them in well-drained soil. They bloom from July to September. Deadhead spent blooms for more flowers, but leave some for winter bird food.
Popular varieties: ‘Magnus’ (deep purple), ‘White Swan’ (white), and ‘PowWow Wild Berry’ (bright pink).
2. Black-Eyed Susan (Rudbeckia)
These golden daisies are practically indestructible. They thrive in poor soil and full sun. Black-eyed Susans bloom nonstop from July to October.
They self-seed readily, so you’ll get more plants each year. Cut back stems in late fall to prevent spreading too much.
Try ‘Goldsturm’ for compact growth or ‘Herbstsonne’ for tall, dramatic stalks.
3. Daylily (Hemerocallis)
Daylilies are not true lilies, but they’re even tougher. Each flower lasts only one day, but plants produce dozens of buds. They bloom in waves from June to August.
They tolerate part shade but bloom best in full sun. Divide clumps every 3-4 years to keep them vigorous.
Top picks: ‘Stella de Oro’ (reblooms all summer), ‘Happy Returns’ (yellow), and ‘Pardon Me’ (red).
4. Zinnia
Zinnias are annuals that thrive in heat. They come in every color except blue. Direct sow seeds after the last frost (late May). They bloom from July to frost.
Pinch back young plants for bushier growth. Water at the base to prevent powdery mildew. Deadhead regularly for continuous flowers.
Try ‘Zahara’ series for disease resistance or ‘Benary’s Giant’ for large blooms.
5. Petunia
Petunias are classic summer annuals. They handle heat and rain well, especially modern varieties. Wave petunias spread beautifully in hanging baskets.
They need regular watering and fertilizer every 2 weeks. Remove spent flowers to keep them tidy. Look for ‘Supertunia’ or ‘Crazytunia’ series for best performance.
Colors range from white to deep purple, with many bicolor options.
6. Salvia
Salvia (ornamental sage) loves hot, dry conditions. The spiky flowers attract hummingbirds and bees. They bloom from June to September with minimal care.
Cut back after the first flush for a second bloom. Most varieties are deer-resistant. Try ‘May Night’ (deep purple) or ‘Caradonna’ (violet-blue).
7. Marigold
Marigolds are foolproof for beginners. They thrive in full sun and poor soil. The strong scent repels some pests, making them great companion plants.
Deadhead regularly for nonstop blooms. French marigolds are compact; African marigolds are tall. Both work well in beds and containers.
Try ‘Durango’ series for heat tolerance or ‘Bonanza’ for early blooms.
8. Liatris (Blazing Star)
Liatris is a native prairie plant. The tall purple spikes bloom from top to bottom. It’s extremely drought-tolerant and attracts butterflies.
Plant corms in spring for summer flowers. It grows well in sandy or rocky soil. Leave flower stalks for winter interest.
Popular: ‘Kobold’ (compact) or ‘Floristan Violet’ (tall).
9. Hibiscus (Hardy)
Hardy hibiscus produces dinner-plate sized blooms. They love wet soil and full sun. Flowers appear in late July and continue until frost.
Cut back stems in spring after new growth appears. They die back to the ground each winter. Try ‘Lord Baltimore’ (red) or ‘Disco Belle’ (pink).
10. Snapdragon
Snapdragons prefer cool weather but can handle Minnesota summers if planted in part shade. They bloom in spring and again in fall after heat passes.
Pinch back young plants for branching. Water consistently to prevent legginess. Tall varieties need staking. Try ‘Rocket’ series for heat tolerance.
Annuals Vs Perennials For Minnesota
Both have advantages. Annuals bloom all season but need replanting each year. Perennials come back but have shorter bloom periods.
Best Annuals For Continuous Color
- Zinnia
- Petunia
- Marigold
- Cosmos
- Sunflower
- Verbena
Best Perennials For Reliable Returns
- Coneflower
- Black-Eyed Susan
- Daylily
- Salvia
- Liatris
- Hibiscus
Planting Tips For Minnesota Summers
Timing matters. Wait until after the last frost (usually mid-May) to plant tender annuals. Perennials can go in earlier if the soil is workable.
Soil Preparation
- Test your soil pH. Most flowers prefer 6.0-7.0.
- Amend heavy clay with compost or peat moss.
- Add slow-release fertilizer at planting time.
- Mulch with 2-3 inches of wood chips to retain moisture.
Watering Guidelines
- Water deeply 1-2 times per week, not daily.
- Water at the base to prevent leaf diseases.
- Use soaker hoses for efficiency.
- Water in the morning to reduce evaporation.
Dealing With Heat Waves
When temps hit 95°F+, provide afternoon shade for sensitive plants. Use shade cloth or plant near taller crops. Water more frequently during heat waves.
Container Gardening For Small Spaces
Not everyone has a big yard. Containers work great for Minnesota summers. Use large pots (at least 12 inches) to prevent roots from overheating.
Best Flowers For Containers
- Petunia (trailing varieties)
- Zinnia (dwarf types)
- Marigold (compact)
- Calibrachoa (million bells)
- Lantana (heat-loving)
Use potting mix, not garden soil. Add slow-release fertilizer. Water daily in hot weather. Move pots to shade during extreme heat.
Dealing With Common Pests And Diseases
Minnesota summers bring aphids, Japanese beetles, and powdery mildew. Prevention is easier than treatment.
Natural Pest Control
- Spray aphids off with water.
- Hand-pick Japanese beetles into soapy water.
- Use neem oil for fungal issues.
- Attract beneficial insects with dill and fennel.
Disease Prevention
- Space plants for air circulation.
- Water at soil level, not on leaves.
- Remove infected leaves immediately.
- Choose disease-resistant varieties.
Extending The Bloom Season
With careful planning, you can have flowers from May to October. Use a mix of early, mid, and late bloomers.
Early Summer Bloomers (June-July)
- Peony
- Iris
- Lupine
- Bleeding Heart
Mid-Summer Stars (July-August)
- Coneflower
- Daylily
- Zinnia
- Liatris
Late Summer/Fall (August-October)
- Sedum
- Aster
- Chrysanthemum
- Goldenrod
Native Plants For Low Maintenance
Native flowers are adapted to our climate. They need less water and fertilizer. They also support local pollinators.
Top Minnesota Natives
- Purple Coneflower
- Black-Eyed Susan
- Butterfly Weed (Asclepias)
- Wild Bergamot (Monarda)
- Prairie Phlox
These plants are available at native plant nurseries. They establish slowly but thrive for years.
Frequently Asked Questions
What flowers bloom all summer in Minnesota?
Zinnias, petunias, marigolds, and coneflowers bloom from June to frost. Deadheading encourages continuous flowers.
Can I grow roses in Minnesota?
Yes, but choose hardy varieties like ‘Knock Out’ or ‘Canadian Explorer’ series. They need full sun and winter protection.
When should I plant flowers in Minnesota?
Annuals after last frost (mid-May). Perennials can go in April or May. Fall planting works for spring-blooming bulbs.
What flowers tolerate wet soil?
Hibiscus, iris, cardinal flower, and swamp milkweed thrive in moist conditions. Avoid plants that rot easily like lavender.
How do I protect flowers from frost?
Cover tender plants with sheets or row covers when frost is forecast. Bring containers indoors overnight. Water plants before frost to insulate roots.
Final Thoughts On Minnesota Summer Flowers
Growing flowers in Minnesota is rewarding if you choose the right plants. Stick with heat-tolerant, rain-resistant varieties. Prepare your soil well and water consistently.
Don’t be afraid to experiment. Some plants may surprise you. Keep notes on what works in your specific microclimate. Your garden will improve each year.
Remember to enjoy the process. Minnesota summers are short but beautiful. Your flower garden can be a highlight of the season with a little planning and care.
Start with a few proven winners from this list. Add more as you gain confidence. Before long, you’ll have a vibrant, colorful garden that thrives in our unique climate.
Happy gardening, and may your blooms be plentiful all summer long.