Dahlias - Key Growing Information
SOWING: Transplant (recommended) - Sow 4-5 weeks before last frost. Cover seed with growing medium and keep soil surface moist until emergence. When seedlings have true leaves, transplant into larger cell packs. To maintain healthy seedlings, do not allow plants to become root bound and do not disturb roots. Direct seed - After last frost when soil is 65–70°F/18–21°C, sow thinly, 2 seeds/ft, 1/4" deep. Cover lightly but firmly. Keep surface moist until emergence. Thin to 9-12" after first true leaves appear.
LIGHT PREFERENCE: Sun.
PLANT HEIGHT: 40-60".
PLANT SPACING: 9-12".
HARDINESS ZONES: Annual.
HARVEST: Before blooms are completely open.
NOTE: Plants propagated from seeds will produce tubers that can be saved, stored and planted out the following spring. In the fall, after plants have died back but before the ground freezes, cut plants back to 2-4" above the soil line and carefully dig tubers and remove excess soil. Let tubers cure for 1-3 days in warm location with some humidity, out of direct sunlight with ample air flow. Pack tubers in peat or vermiculite inside perforated plastic bags, boxes or crates.
SCIENTIFIC NAME: Dahlia variabilis