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key growing information
How to Grow Eryngium (Sea Holly) From Seed
How to grow eryngium (sea holly) from seed: long lead time, light for germination, cool growing temperatures, dry soil, spacing and cutting for fresh or dried use.
By Hensley’s Seed Co.
Eryngium - Key Growing Information
DAYS TO GERMINATION:
Expect 7–10 days at 72–75°F (22–24°C).
SOWING:
Transplants are recommended: start seed 10–16 weeks before planting out. Leave it uncovered, since it needs light, and water from below or mist gently so it isn't buried. Pot seedlings up into cell packs or 2-4" containers 5–8 weeks after emergence, then harden off and plant out after the last frost.
GROWING ON:
Keep plants cool, at 55–60°F (13–16°C), and avoid temperatures over 70°F (21°C).
LIGHT PREFERENCE:
Full sun.
SOIL REQUIREMENTS:
Dry, sandy soil; tolerates salty conditions. Overwatering is harmful.
PLANT SPACING:
18–24" apart. Clumps spread slowly and can be left undisturbed for years.
HARDINESS ZONES:
Hardy in Zones 3–8.
HARVEST:
For fresh or dried use, cut once the whole flower head and its bracts have turned blue or white, depending on variety. Air dry by hanging, or use a desiccant to keep more color.
USES:
A great fresh or dried cut flower; suits the middle of a perennial border.
SCIENTIFIC NAME:
Eryngium planum
ALTERNATE NAMES:
Flat sea holly, plains eryngo
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