How to grow Dahlia Seeds
Dahlias grown from seed can produce colourful flowers from late summer into early fall, depending on the variety. They are best started indoors before planting out after the danger of frost has passed.
Starting Dahlia Seeds Indoors
Start the seeds indoors about 6–8 weeks before the last expected frost date in your area. Plant the seeds in seed trays or small pots filled with seed starting mix.
Germination
Dahlia seeds can take 7–21 days or longer to germinate. Keep the soil moist during this time.
Planting
Sow the seeds on the surface of the soil and lightly press them into the soil. Do not cover the seeds with more soil, as they need light to germinate.
Warmth & Moisture
Place the seed trays in a warm location with temperatures around 21–24°C. Keep the soil consistently moist but not waterlogged.
Transplanting
Once the seedlings have developed several sets of true leaves and the danger of frost has passed, they can be transplanted into larger pots or directly into the garden.
Outdoor Care
Choose a sunny location with well-draining soil for planting dahlias.
Maintenance
Water the dahlias regularly, especially during dry periods. Mulching around the plants can help retain moisture and suppress weeds.
Blooming
With proper care, dahlias grown from seeds will start to bloom in late summer or early fall, depending on the variety.