Top Annual Flowers to Seed in March for Zone 7 Gardens

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March is a crucial month for gardeners in Zone 7, as it marks the beginning of the planting season for many annual flowers. Starting your seeds early ensures a vibrant and colorful garden throughout the warmer months. Here are some of the top annual flowers to seed in March for Zone 7 gardens.

Why Seed in March?

Seeding in March allows plants to establish strong roots before the heat of summer. Zone 7’s climate provides a long growing season, making it ideal for starting many flowers indoors or outdoors early. Proper timing ensures blooms are abundant and healthy.

Top Annual Flowers to Seed in March

  • Petunias: Known for their vibrant colors and long blooming period, petunias thrive when seeded early. Sow indoors 8-10 weeks before the last frost date.
  • Marigolds: Hardy and easy to grow, marigolds can be started indoors or directly sown outdoors once the soil warms.
  • Zinnias: Zinnias are heat-tolerant and produce bright, cheerful flowers. Start seeds indoors for an early start.
  • Cosmos: These delicate flowers grow quickly from seed and attract pollinators. Sow directly in the garden after the danger of frost.
  • Sunflowers: Ideal for sunny spots, sunflowers can be started indoors or sown directly outdoors in March.
  • Impatiens: Perfect for shady areas, impatiens should be started indoors for best results.
  • Cleome: Also known as spider flower, cleome is a tall, striking annual that can be started indoors in March.

Seed Starting Tips for Zone 7

To ensure successful germination and healthy plants, consider the following tips:

  • Use quality seed-starting soil to provide essential nutrients.
  • Maintain consistent moisture without overwatering.
  • Provide adequate light using grow lights if natural sunlight is insufficient.
  • Keep temperature steady around 65-75°F for optimal germination.
  • Harden off seedlings gradually before transplanting outdoors.

Transplanting Tips

Once the danger of frost has passed, usually by late March or early April in Zone 7, harden off your seedlings by gradually exposing them to outdoor conditions. Transplant on a cloudy day or in the late afternoon to minimize stress. Space plants according to their growth habits to promote healthy development.

Conclusion

Seeding annual flowers in March sets the stage for a beautiful garden throughout the spring and summer. By choosing the right flowers and following proper starting techniques, Zone 7 gardeners can enjoy a burst of color and life in their outdoor spaces. Happy gardening!