Minnesota’s short growing season means July is the perfect time to add late-summer color before the first frost. Finding the best flowers to plant in july in minnesota can feel tricky, but many varieties thrive when planted mid-summer. You can still enjoy blooms from August through October with the right choices.
This guide covers annuals, perennials, and even a few bulbs that handle July heat well. You will get step-by-step planting tips and care advice specific to Minnesota’s climate. Let’s jump into the flowers that will keep your garden vibrant until the cold returns.
Best Flowers To Plant In July In Minnesota
July in Minnesota brings warm soil and long daylight hours. This creates ideal conditions for many flowers to establish quickly. The key is choosing plants that mature fast or tolerate heat.
Below are the top picks for July planting. Each flower is selected for its ability to bloom before the first frost, which typically hits between late September and mid-October in most of the state.
Annual Flowers For Quick Color
Annuals are your best bet for instant impact. They grow fast and bloom until frost kills them. Here are the top annuals for July planting in Minnesota.
Marigolds
Marigolds are heat-tolerant and bloom within weeks of planting. They come in yellow, orange, and red shades. Plant them in full sun for best results. They also repel some garden pests naturally.
Zinnias
Zinnias are among the fastest-growing annuals. They go from seed to flower in about 60 days. July-planted zinnias will bloom by early September. They love hot weather and need little care. Deadhead spent blooms to encourage more flowers.
Cosmos
Cosmos thrive in poor soil and heat. They produce delicate pink, white, and magenta flowers on tall stems. Plant seeds directly in the ground in early July. They will bloom by late August and continue until frost.
Sunflowers
Sunflowers grow quickly and make a bold statement. Choose fast-maturing varieties like ‘Sunspot’ or ‘Teddy Bear’. These bloom in 50-60 days. Plant seeds in early July for September flowers. They attract bees and birds to your garden.
Petunias
Petunias are classic summer annuals. Buy them as transplants from a nursery for July planting. They bloom nonstop until frost. Choose trailing varieties for hanging baskets or upright types for beds. Water them regularly in hot weather.
Perennial Flowers For Long-Term Beauty
Perennials planted in July have time to establish roots before winter. They may not bloom heavily this year, but they will return stronger next spring. Here are the best perennials for July planting in Minnesota.
Black-Eyed Susans
Black-eyed Susans are tough Minnesota natives. They bloom from July through September. Plant them in full sun and well-drained soil. They tolerate drought once established. Their yellow petals and dark centers add cheerful color.
Coneflowers
Coneflowers are hardy perennials that attract pollinators. They bloom in pink, purple, white, and orange. July planting gives them time to root before winter. They will bloom next summer from June to August. Cut back stems in late fall.
Daylilies
Daylilies are nearly indestructible. Plant them in July for blooms next year. They come in many colors and heights. Each flower lasts only one day, but plants produce many buds. They tolerate part shade and poor soil.
Hostas
Hostas are perfect for shady spots. Plant them in July for lush foliage next season. They bloom with lavender or white flowers in late summer. Keep them watered during dry spells. Slugs can be a problem, so use organic controls if needed.
Sedum
Sedum is a succulent perennial that loves heat. It blooms in late summer with pink or red flowers. Plant it in full sun and well-drained soil. It is very drought-tolerant once established. Sedum also provides winter interest with its dried flower heads.
Bulbs To Plant In July For Fall Blooms
Most bulbs are planted in fall, but a few can go in the ground in July. These will bloom in late summer or early fall. They add surprise color when other flowers fade.
Lilies
Lily bulbs planted in July will bloom in August or September. Choose Asiatic or Oriental varieties. Plant them 6-8 inches deep in well-drained soil. They need full sun to part shade. Stake tall varieties to prevent flopping.
Dahlias
Dahlias are technically tubers, not true bulbs. Plant them in July for fall blooms. They produce large, showy flowers in many colors. Dig them up after the first frost and store indoors for winter. They are worth the extra effort.
Gladiolus
Gladiolus corms planted in July will bloom in September. Plant them every two weeks for continuous flowers. They need full sun and well-drained soil. Stake the tall flower spikes to keep them upright. Dig up corms before the ground freezes.
How To Plant Flowers In July In Minnesota
July planting requires a few special steps. The soil is warm, but heat can stress new plants. Follow these tips for success.
Prepare The Soil
Minnesota soil varies from sandy to clay-heavy. Test your soil drainage by digging a small hole and filling it with water. If water drains in 1-2 hours, the soil is good. If it takes longer, amend with compost or peat moss.
- Remove weeds and grass from the planting area.
- Loosen soil to a depth of 8-10 inches.
- Mix in 2-3 inches of organic compost.
- Add a slow-release fertilizer according to package directions.
Water Deeply And Consistently
July heat dries out soil quickly. New plants need consistent moisture to establish roots. Water deeply once or twice a week, depending on rainfall. Aim for 1 inch of water per week, including rain.
Water in the morning to reduce evaporation. Avoid wetting the leaves to prevent fungal diseases. Use a soaker hose or drip irrigation for best results.
Mulch To Retain Moisture
Mulch is essential for July planting. It keeps soil cool and moist. Apply a 2-3 inch layer of organic mulch like shredded bark or straw. Keep mulch away from plant stems to prevent rot.
Mulch also suppresses weeds that compete for water. Replenish mulch as needed during the summer.
Protect From Extreme Heat
If temperatures soar above 90°F, provide temporary shade. Use shade cloth or an old sheet supported by stakes. Remove the shade after a week once plants are established. Water more frequently during heat waves.
Caring For July-Planted Flowers
After planting, ongoing care ensures healthy growth and abundant blooms. Here is what to do for the rest of the season.
Fertilize Lightly
Annuals benefit from regular feeding. Use a balanced liquid fertilizer every 2-3 weeks. Perennials need less fertilizer. Apply a slow-release granular fertilizer at planting time. Avoid over-fertilizing, which can cause leggy growth.
Deadhead Spent Blooms
Remove faded flowers to encourage more blooms. This works especially well for zinnias, marigolds, and petunias. Use clean scissors or pruners. Cut back to a leaf node or side bud.
Watch For Pests
July brings common garden pests like aphids, Japanese beetles, and spider mites. Inspect plants weekly. Remove pests by hand or spray with a strong jet of water. Use insecticidal soap for severe infestations.
Avoid broad-spectrum pesticides that kill beneficial insects. Encourage ladybugs and lacewings by planting dill, fennel, or yarrow nearby.
Prepare For First Frost
Minnesota’s first frost can arrive as early as mid-September in northern areas. Southern areas may have until early October. Monitor local frost dates. Cover tender annuals with a sheet or frost cloth if frost is predicted.
For perennials, stop fertilizing by mid-August. This helps them harden off for winter. Water deeply before the ground freezes to prevent winter desiccation.
Common Mistakes When Planting Flowers In July In Minnesota
Avoid these pitfalls to ensure your July planting succeeds.
Planting Too Late In The Season
Some flowers need 60-90 days to bloom. If you plant in late July, they may not flower before frost. Check the “days to maturity” on seed packets. Stick to fast-growing varieties for late planting.
Overwatering New Plants
It is easy to overwater in hot weather. Soggy soil leads to root rot. Water only when the top inch of soil feels dry. Use your finger to test moisture before watering.
Skipping Soil Preparation
Planting in compacted or poor soil stresses plants. Always amend with compost. Test pH if possible. Most flowers prefer slightly acidic to neutral soil (pH 6.0-7.0).
Ignoring Spacing Requirements
Crowded plants compete for water and nutrients. Follow spacing guidelines on plant tags. Good air circulation reduces disease risk.
Frequently Asked Questions
Can I Plant Flower Seeds Directly In The Ground In July In Minnesota?
Yes, but choose fast-growing annuals like zinnias, cosmos, and marigolds. Water seeds daily until they germinate. Keep the soil consistently moist. Seeds may need extra care in hot weather.
What Flowers Bloom The Fastest From Seed In July?
Zinnias, marigolds, and sunflowers bloom fastest. They flower in 50-70 days from seed. Nasturtiums and calendula are also quick. Buy transplants for even faster results.
Should I Fertilize Flowers Planted In July?
Yes, but lightly. Use a balanced fertilizer at planting time. For annuals, continue feeding every 2-3 weeks. Perennials need less fertilizer. Stop fertilizing perennials by mid-August to prepare them for winter.
Can I Plant Perennials In July In Minnesota?
Yes, perennials like black-eyed Susans, coneflowers, and daylilies do well. They need time to establish roots before winter. Water them deeply and mulch well. They may not bloom much this year but will return next spring.
What Flowers Survive Minnesota Winters If Planted In July?
Hardy perennials like coneflowers, sedum, and hostas survive winter. Choose varieties rated for USDA zones 3-4. Mulch around the base after the ground freezes. Remove mulch in early spring.
Final Tips For July Planting Success
July is not too late to add beauty to your Minnesota garden. Focus on fast-growing annuals for immediate color. Add perennials for long-term rewards. Water consistently and mulch well to beat the heat.
Check your local frost date to plan your planting. Northern Minnesota may have frost by mid-September. Southern areas have until early October. Choose flowers with enough time to bloom before then.
Visit local nurseries for transplants suited to your area. Minnesota-grown plants are already acclimated to the climate. Ask staff for recommendations specific to your sun and soil conditions.
With the right choices, your garden will stay colorful well into fall. Enjoy the late-season blooms and the satisfaction of a garden that keeps giving. Happy planting from the Land of 10,000 Lakes.