Thistle-like leaves and blue flowers with starry collars of silvery green makes Mrs. Willmott's ghost, or seaholly a favorite perennial for sunny gardens. Eryngium giganteum is a hardy herbaceous biennial native to the moist, well-drained soils of Iran and the Caucasus of extreme westcentral Asia. It has a dense basal rosette of heart-shaped, coarse, spiny and teethed green leaves iwth white edges and veins. In summer it produces starry flowers with a barreled cluster of fertile, tiny blue flowers surrounded by many spiny bracts (modified leaves) that are green with white and silvery veins and blush.
The long-lasting flowers are borne atop branched stems and are highly attractive to bees and butterflies. If the seedheads are allowed to mature, it will readily self-sow.
Grow Miss Willmott's ghost in in full sun and porous soil that is fertile and moist but certaintly well-draining. It is quite drought tolerant once established.
Avoid wet soil conditions in the winter. This short-lived perennial is deep-rooted and difficult to transplant, so choose a good planting site for it grow undisturbed and allow it to reseed itself.
It is a lovely and interesting perennial for sunny borders, and its cool, architectural flowers compliment many other brightly colored ornamentals. The flowers make long-lasting cutflowers for fresh and dried arrangements.
Information source: http://learn2grow.com/plants/eryngium-giganteum/
Genus - Eryngium
Species - Giganteum
Variety - Miss Willmotts Ghost
Common name - Seaholly
Pre-Treatment - Not-required
Hardiness zones - 4 - 9
Height - 0,70 - 0,90 m
Spread - 0,35 m
Plant type - Perennial Flower
Exposure - Full Sun, Partial Sun
Growth rate - Medium
Soil PH - Acid, neutral, alkaline
Soil type - Clay, loam, sand, well drained
Water requirements - Average, drought tolerant
Landscape uses - Cutflower, Dried Flower/Everlasting, Mixed Border, Rock Garden / Wall, Wildflower
Bloom season - June - October
Leaf / Flower color - Light Green / White - green
Sow seeds indoors from January to April in trays of seed compost. Cover with a very fine layer of compost.
Sow thinly, cover with clear plastic or glass.
Keep at +15-20C.
Firm gently and keep moist.
Seedlings appear in 14-35 days.
If germination kas not started, transfer to the refrigerator for 2 weeks before returning to the warmth to trigger the germination process.
Remove cover then seedlings appear and grow at +13-15C.
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