Minnesota’s brutal winters mean annuals must perform fast, and calendula delivers bright blooms from seed in under eight weeks. If you’re looking for the easiest annual flowers to grow in minnesota, you’ve come to the right place. This guide covers top picks that thrive in our short, unpredictable growing season, with minimal fuss and maximum color.
Annuals are plants that complete their life cycle in one season. They grow, flower, set seed, and die before frost. In Minnesota, that means you need varieties that germinate quickly, handle cool nights, and bloom non-stop until October. The key is choosing tough, low-maintenance species that don’t demand constant watering or deadheading.
Below, you’ll find a list of the most reliable annuals for our state. Each one has been tested in local gardens and proven to handle everything from late snow to July heatwaves. Let’s get started.
Easiest Annual Flowers To Grow In Minnesota
This section breaks down the top performers. These flowers are forgiving, fast-growing, and perfect for beginners or busy gardeners. They also attract pollinators and add instant curb appeal.
Calendula: The Cold-Hardy Champion
Calendula, or pot marigold, is one of the first annuals you can sow directly outdoors. It tolerates light frost and germinates in soil temps as low as 50°F. In Minnesota, you can plant seeds in early May, even if a late frost is predicted.
- Bloom time: 6-8 weeks from seed
- Height: 12-24 inches
- Sun: Full sun to partial shade
- Soil: Average, well-drained
- Care: No deadheading needed for continuous bloom
Calendula petals are edible and make a nice addition to salads. They also self-sow lightly, so you might see volunteers next year. Just pull them out if they appear where you don’t want them.
Nasturtium: Edible Flowers, Zero Fuss
Nasturtiums are another top choice for Minnesota gardens. They grow quickly from seed and thrive in poor soil. In fact, rich soil leads to more leaves than flowers. Plant them in a spot with full sun and average moisture.
- Sow seeds directly after last frost (late May).
- Soak seeds overnight for faster germination.
- Space 12 inches apart.
- Water only during dry spells.
- Harvest flowers and leaves for salads.
Nasturtiums come in trailing and bushy varieties. Trailing types work well in hanging baskets or as ground cover. Bushy types are great for borders. They repel aphids and other pests, making them a good companion plant.
Zinnia: Heat-Loving Color Machine
Zinnias are the workhorses of the summer garden. They bloom from July until the first hard frost, and they come in every color except blue. In Minnesota, they love the heat and humidity of July and August.
- Varieties: ‘Benary’s Giant’, ‘Zahara’, ‘Profusion’
- Height: 6-40 inches depending on type
- Sun: Full sun (6+ hours)
- Soil: Well-drained, moderate fertility
- Care: Deadhead spent blooms for more flowers
Zinnias are also excellent cut flowers. They last up to two weeks in a vase. To keep them blooming, remove faded flowers regularly. Powdery mildew can be an issue in humid weather, so space plants for good air circulation.
Marigold: The Reliable Classic
French and African marigolds are staples in Minnesota gardens. They are incredibly easy to grow from seed or transplants. They tolerate heat, drought, and poor soil better than most annuals.
French marigolds stay compact (6-12 inches) and bloom in shades of orange, yellow, and red. African marigolds grow taller (up to 3 feet) and have large, pom-pom flowers. Both types repel nematodes and other soil pests.
- Plant after frost danger passes.
- Water at the base to avoid leaf diseases.
- Deadhead for continuous bloom.
- Fertilize lightly once a month.
Marigolds are also deer-resistant. If you have trouble with rabbits or deer, plant marigolds around the border of your garden. Their strong scent deters many animals.
Sunflower: Fast, Tall, And Cheerful
Sunflowers are one of the fastest-growing annuals. Some varieties reach 6 feet in 60 days. They are perfect for kids or beginner gardeners because they need almost no care.
- Choose a sunny spot with good drainage.
- Sow seeds 1 inch deep after last frost.
- Space 6-12 inches apart for smaller types, 24 inches for giants.
- Water weekly until established.
- Stake tall varieties if needed.
Sunflowers attract bees, butterflies, and birds. Leave the seed heads in fall for goldfinches. You can also harvest seeds for snacks or bird feed. Just protect the heads with netting if birds start eating them too early.
Cosmos: Airy Beauty On Neglect
Cosmos are the ultimate low-maintenance annual. They thrive in poor, dry soil and bloom from midsummer until frost. In Minnesota, they handle our hot summers and cool nights with ease.
- Varieties: ‘Sensation’, ‘Cosmic’, ‘Bright Lights’
- Height: 2-5 feet
- Sun: Full sun
- Soil: Lean, well-drained (no fertilizer needed)
- Care: Cut back after first bloom for a second flush
Cosmos self-sow readily. Once you plant them, you’ll likely see volunteers for years. They are also great for filling gaps in the garden. Their feathery foliage adds texture even when not in bloom.
Sweet Alyssum: Fragrant Ground Cover
Sweet alyssum is a low-growing annual that forms a carpet of tiny flowers. It has a honey-like scent and attracts beneficial insects. In Minnesota, it blooms from June to October with little care.
- Height: 4-6 inches
- Spread: 12-18 inches
- Sun: Full sun to partial shade
- Soil: Average, well-drained
- Care: Trim back if it gets leggy
Sweet alyssum works well as a border plant or in containers. It also tolerates light frost, so you can plant it early. In fall, it often keeps blooming until a hard freeze.
Snapdragon: Cool-Season Favorite
Snapdragons are technically tender perennials, but we grow them as annuals in Minnesota. They love cool weather and bloom heavily in spring and fall. In summer, they may slow down but will pick up again when temperatures drop.
- Start seeds indoors 8-10 weeks before last frost.
- Harden off seedlings before transplanting.
- Plant in full sun to partial shade.
- Pinch back young plants for bushier growth.
- Deadhead regularly for continuous bloom.
Snapdragons come in many heights, from dwarf (6 inches) to tall (3 feet). They make excellent cut flowers and add vertical interest to beds. They are also deer-resistant.
Cleome: Tall, Dramatic, And Self-Sowing
Cleome, or spider flower, is a tall annual that adds height and drama to the garden. It has unique spiky flowers that attract hummingbirds and butterflies. In Minnesota, it blooms from July to frost.
- Height: 3-5 feet
- Sun: Full sun
- Soil: Average, well-drained
- Care: No deadheading needed
- Self-sows: Yes, often aggressively
Cleome is very drought-tolerant once established. It also has a strong, somewhat musky scent that some people dislike. Plant it at the back of borders where its height can shine.
Planting Tips For Minnesota Gardens
Getting annuals off to a good start is crucial in our short season. Here are some practical tips to ensure success.
Timing Your Planting
Minnesota’s last frost date varies by region. In the Twin Cities, it’s around May 15. In northern Minnesota, it can be as late as June 1. Always check your local frost dates before planting tender annuals.
- Cool-season annuals (calendula, snapdragon): Plant 2-4 weeks before last frost.
- Warm-season annuals (zinnia, marigold, sunflower): Plant after last frost.
- Use row covers or cloches to protect early plantings from late frosts.
Soil Preparation
Most annuals prefer well-drained soil with moderate fertility. In Minnesota, our soil can be heavy clay or sandy. Amend with compost to improve drainage and nutrient content.
- Test soil pH (aim for 6.0-7.0).
- Add 2-3 inches of compost and till in.
- Remove rocks and debris.
- Rake smooth before planting.
Watering Wisely
Annuals need consistent moisture, especially during establishment. Once established, many are drought-tolerant. Water deeply once a week rather than shallowly every day.
- Water at the base to prevent leaf diseases.
- Use soaker hoses or drip irrigation for efficiency.
- Mulch around plants to retain moisture and suppress weeds.
Common Mistakes To Avoid
Even easy annuals can fail if you make these errors. Here’s what to watch out for.
Overwatering
Too much water leads to root rot and fungal diseases. Let the top inch of soil dry out between waterings. In clay soil, be especially careful not to overwater.
Planting Too Early
Impatient gardeners often plant warm-season annuals before the soil warms up. Soil temps below 60°F slow growth and can cause seeds to rot. Wait until the soil is consistently warm.
Ignoring Spacing
Crowded plants compete for light, water, and nutrients. They also have poor air circulation, which encourages disease. Follow spacing recommendations on seed packets or plant tags.
FAQ: Easiest Annual Flowers To Grow In Minnesota
Here are answers to common questions about growing annuals in our state.
What are the best annual flowers for full sun in Minnesota?
Zinnias, marigolds, sunflowers, cosmos, and cleome all thrive in full sun. They need at least 6 hours of direct sunlight daily.
Can I grow annuals in shade in Minnesota?
Yes. Impatiens, begonias, and coleus are good choices for partial to full shade. However, they are more sensitive to cold and should be planted after frost.
How do I protect annuals from early frost?
Use row covers, old sheets, or plastic sheeting overnight. Remove covers in the morning. For potted plants, bring them indoors or into a garage.
Do I need to fertilize annuals?
Most annuals benefit from a light application of balanced fertilizer (10-10-10) once a month. Avoid over-fertilizing, which leads to lush leaves and few flowers.
What annuals are deer-resistant?
Marigolds, snapdragons, and calendula are generally deer-resistant. No plant is completely deer-proof, but these are less appealing to them.
Final Thoughts On Easy Annuals
Growing annuals in Minnesota doesn’t have to be complicated. Stick with the flowers listed here, and you’ll have a colorful garden from June to October. Start seeds indoors for earlier blooms, or direct sow for less work.
Remember to water wisely, deadhead when needed, and enjoy the process. Gardening is supposed to be fun, not stressful. With these easiest annual flowers to grow in minnesota, you can sit back and watch your garden thrive.
If you have more questions, check with your local extension office or garden center. They can provide specific advice for your microclimate. Happy planting!