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key growing information
Growing Zinnias from Seed
How to grow zinnias from seed: warm germination, transplants without root disturbance, direct sowing, succession, pinching and deadheading, frost and cold sensitivity, cutting stage, soil and uses.
By Hensley’s Seed Co.
Zinnia - Key Growing Information
DAYS TO GERMINATION:
Seedlings appear in just 3–5 days at 80–85°F (27–29°C).
SOWING:
Transplants are recommended: sow into 72-cell flats or your usual containers 4 weeks before planting out, and cover the seed. A heat mat helps hold the right temperature; at 70–75°F (21–24°C), germination slows to 5–7 days. Don't let plants get rootbound, and avoid disturbing the roots, since transplant shock or other stress can make double types bloom single for a while. To sow in place, plant ¼" deep. Sow or plant every 2 weeks for a long run of quality stems. Pinch out the first bud or bloom and keep deadheading to encourage strong branching and more flowers. Zinnias are very frost-tender.
LIGHT PREFERENCE:
Full sun.
PLANT HEIGHT:
Depends on the variety; no support needed.
PLANT SPACING:
Space plants 9–12" apart.
HARDINESS ZONES:
Grown as an annual.
VASE LIFE:
About 7–10 days.
STORAGE TEMPERATURE:
Store cut stems at 40–50°F (4–10°C); zinnias are easily damaged by cold.
HARVEST:
Cut before flowers are fully open, when the stem is firm from the cut right up to just under the bloom.
SOIL REQUIREMENTS:
Fertile soil rich in organic matter, ideally pH 6.3–6.8.
USES:
Taller types make superb cut flowers; also good in beds, borders and mass plantings.SCIENTIFIC NAME: Zinnia spp.
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