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key growing information
Growing Dahlias From Seed
How to grow dahlias from seed: starting transplants, avoiding root-bound seedlings, direct sowing, cutting stage, and digging and storing tubers for next year.
By Hensley’s Seed Co.
Dahlias - Key Growing Information
DAYS TO GERMINATION:
Seedlings come up fast, in about 3–5 days at 65–70°F (18–21°C).
SOWING:
Transplants are recommended: sow 4–5 weeks before the last frost, cover the seed with mix, and keep the surface moist until seedlings appear. Once they have true leaves, move them into bigger cell packs. Keep seedlings healthy by never letting them get root-bound and by disturbing the roots as little as possible. For direct sowing, wait until after the last frost when the soil is 65–70°F (18–21°C); sow thinly, 2 seeds per foot, 1/4" deep, covering lightly but firmly. Keep the surface moist until emergence and thin to 9–12" once true leaves form.
LIGHT PREFERENCE:
Full sun.
PLANT HEIGHT:
Grows about 40–60" tall.
PLANT SPACING:
Space plants 9–12" apart.
HARDINESS ZONES:
Grown as an annual.
HARVEST:
Cut before the flowers are fully open.NOTE: Seed-grown plants form tubers you can save and replant next spring. In fall, once the tops have died back and before the ground freezes, cut stems down to 2–4" and dig the tubers carefully, shaking off extra soil. Cure them for 1–3 days somewhere warm and slightly humid, out of direct sun and with good airflow. Then pack them in peat or vermiculite in perforated plastic bags, boxes or crates. SCIENTIFIC NAME: Dahlia variabilis
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