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Evergreen thistle-like leaves and steel blue flowers makes the flat seaholly or blue eryngo a favorite perennial for sunny, gravelly gardens. Eryngium planum is a hardy herbaceous perennial native to dry rocky mountain slopes of southeastern Europe to central Asia. It has a dense basal rosette of heart-shaped, coarse, spiny dark green leaves that are leathery. In summer it produces plume-like flowers with a barreled cluster of fertile, tiny pale blue flowers surrounded by many spiny bracts (modified leaves) of blue-gray. The long-lasting flowers are borne atop branched stems that have blue-green lobed leaves. Flowers are highly attractive to bees and butterflies. If the seedheads are allowed to mature, it may self-sow.
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. (Info source: Learn2Grow.com)
Genus - Eryngium
Species - Planum
Common name - Blue Eryngo
Pre-Treatment - Required
Hardiness zones - 5 - 9
Height - 30"-36" / 0.70 - 0.90 m
Spread - 15"-20" / 0.40 - 0.50 m
Plant type - Perennial
Exposure - Full Sun, Partial Sun
Growth rate - Medium
Soil PH - Neutral, Alkaline
Soil type - Clay, Loam, Sand, Well Drained
Water requirements - Drought Tolerant, Average Water
Landscape uses - Cutflower, Dried Flower/Everlasting, Mixed Border, Rock Garden / Wall, Wildflower
Germination rate - 72%
Bloom season - Summer, Late Summer, Early Fall
Leaf / Flower color - Green, Dark Green, Gray / Light Blue, Gray Green, Silver
