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key growing information
Growing Larkspur Flowers from Seed: How to Sow, Care for & Harvest
How to grow larkspur from seed: pre-chilling, cool soil for germination, spring or fall direct sowing, transplants, support and cutting stage.
By Hensley’s Seed Co.
Larkspur - Key Growing Information
DAYS TO GERMINATION:
Allow 14–21 days at a cool 55°F (13°C). Chilling the seed for 7 days at 35°F (2°C) first improves germination.
SOWING:
Sowing in place is recommended: plant ¼" deep, since the seed needs darkness, in early spring for summer flowers or in fall for bloom the next year. Germination falls off when the soil is warmer than 55°F (13°C). For transplants, sow into 72-cell plug flats or your usual containers 5–7 weeks before planting out, and grow them at about 55°F (13°C) until they go outside. Larkspur does best where summers are cool.
LIGHT PREFERENCE:
Full sun.
PLANT HEIGHT:
36–48"; staking or netting is recommended.
PLANT SPACING:
Space plants 4–6" apart.
HARDINESS ZONES:
Grown as an annual.
STEM LENGTH:
12-40".
VASE LIFE:
About 5–7 days.
HARVEST:
For fresh use, cut when 2–3 of the lowest flowers are open on up to a third of the stem. For drying, cut when the flowers on the stem have opened but before petals start to fall.
SOIL REQUIREMENTS:
Rich, well-drained, slightly alkaline soil.
USES:
A superb fresh or dried cut flower; good at the back of beds.
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