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key growing information
How To Grow Rosemary From Seed
How to grow rosemary from seed: starting early indoors, light for germination, cool temperatures, primed seed, spacing as an annual or perennial, overwintering, soil and harvest.
By Hensley’s Seed Co.
Rosemary from Seed - Key Growing Information
DAYS TO GERMINATION:
Allow 14–21 days at 65–70°F (18–21°C).
SOWING:
Transplants are recommended: start seed in flats 10–12 weeks ahead of the last frost. Scatter seed on the surface and press it in gently, covering it very lightly at most, since it needs light to germinate. Keep flats at 55–60°F (13–16°C) and the mix moist but not wet until seedlings appear. Thin, or move plants to their own containers, at 4 true leaves. Plant out after the last frost in rows 18–36" apart, 8–10" apart in the row where grown as an annual or 24–36" where grown as a perennial. In colder areas, rosemary may survive winter if mulched, or dug and potted up in a protected structure. Primed seed should be pressed into the surface and germinated at 70°F (21°C), then treated like regular seed once it sprouts.
LIGHT PREFERENCE:
Full sun.
SOIL REQUIREMENTS:
Does best in light soil with good drainage.
PLANT HEIGHT:
Grows about 18–60" tall.
PLANT SPACING:
8–24" tall. Space plants 8–10" apart as an annual or 24–36" as a perennial.
HARDINESS ZONES:
Hardy in Zones 6–10.
HARVEST:
Expect to start picking stem tips about 80–100 days after planting, or 120–180 days for bunches. To dry, hang small bunches somewhere dry and out of direct sun.
SCIENTIFIC NAME:
Rosmarinus officinalis
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