Growing Dahlias from Seed

Growing dahlias from seed is a rewarding process that allows you to enjoy a variety of colors and forms. Here's a step-by-step guide to help you get started:

1. Gather Supplies

  • Dahlia seeds (available from garden centers or online)

  • Seed-starting mix

  • Seed trays or small pots

  • Clear plastic cover or plastic wrap

  • Labels and markers

  • Watering can or spray bottle

  • Grow lights or a sunny window

  • Fertilizer (optional)

2. Sow the Seeds

  1. Timing: Start dahlia seeds indoors about 6-8 weeks before the last expected frost in your area.

  2. Fill Trays: Fill seed trays or pots with seed-starting mix, leaving about 1/2 inch from the top.

  3. Moisten Soil: Lightly moisten the soil with water.

  4. Plant Seeds: Sprinkle the seeds on the surface of the soil, then cover them with a thin layer of the seed-starting mix (about 1/8 inch).

  5. Label: Label the trays or pots with the variety and date of sowing.

3. Germinate the Seeds

  1. Cover: Cover the trays or pots with a clear plastic cover or plastic wrap to create a humid environment.

  2. Light: Place the trays in a warm location with indirect light. If you have grow lights, place them a few inches above the trays.

  3. Temperature: Maintain a temperature of around 70-75°F (21-24°C) for optimal germination.

  4. Monitor: Check daily for moisture and ensure the soil remains damp but not waterlogged.

4. Care for Seedlings

  1. Uncover: Once the seeds germinate (usually in 7-14 days), remove the plastic cover.

  2. Light: Move the seedlings to a location with bright light or under grow lights for 14-16 hours a day.

  3. Watering: Water the seedlings regularly, keeping the soil consistently moist.

  4. Thinning: When the seedlings develop their first true leaves, thin them out, leaving the strongest plants if they are too crowded.

5. Transplanting

  1. Hardening Off: About a week before planting outdoors, start hardening off the seedlings. Gradually introduce them to outdoor conditions by placing them outside for a few hours each day, increasing the time each day.

  2. Location: Choose a sunny location with well-draining soil for planting dahlias.

  3. Prepare Soil: Prepare the garden bed by adding compost or well-rotted manure to improve soil fertility.

  4. Transplant: Transplant the seedlings outdoors after the last frost date when the soil has warmed up. Space them about 12-18 inches apart.

  5. Watering: Water the plants thoroughly after transplanting.

6. Care for Mature Plants

  1. Watering: Water the dahlias deeply once or twice a week, depending on weather conditions.

  2. Fertilizing: Apply a balanced fertilizer every 3-4 weeks during the growing season.

  3. Staking: As the plants grow, they may need staking to support the heavy blooms.

  4. Deadheading: Remove spent flowers to encourage continuous blooming.

7. Harvesting Seeds (Optional)

  1. Seed Collection: At the end of the growing season, allow some flower heads to dry on the plant. Collect the seeds from the dried flower heads.

  2. Storage: Store the seeds in a cool, dry place for planting next season.

By following these steps, you'll be able to grow beautiful dahlias from seed and enjoy their vibrant blooms throughout the summer and fall.

Happy Growing, Mareen