Thistle-like leaves and steel blue stems and flowers makes the alpine seaholly a favorite perennial for gravelly gardens.
Eryngium alpinum is a hardy herbaceous perennial native to dry rocky mountain slopes of southeastern Europe, including the Alps. Decorative perennial for cutting and drying.
In summer it produces plume-like flowers with a barreled cluster of fertile, tiny white or blue flowers surrounded by multiple rows of spiny bracts (modified leaves) of silvery blue to blue-purple. The long-lasting flowers are borne atop steel blue, branched stems and are highly attractive to bees and butterflies. If the seedheads are allowed to mature, it may self-sow.
Info source: Learn2Grow.com
Genus - Eryngium
Species - Alpinum
Variety - Superbum
Common name - Alpine Seaholly
Pre-Treatment - Required
Hardiness zones - 4 - 9
Height - 0,80 m
Spread - 0,40 m
Plant type - Perennial
Exposure - Full Sun, Partial Sun
Growth rate - Medium
Soil PH - Neutral, Alkaline
Soil type - Average garden soil
Water requirements - Drought Tolerant, Average Water
Landscape uses - Cutflower, Dried Flower/Everlasting, Mixed Border, Rock Garden / Wall
Bloom season - June - August
Leaf / Flower color - Green, Dark Green, Gray / Blue Violet
Needs cold germination.
Expose seeds to winter temperature (+4 - -4C) for minimum 8 weeks. Afterwards, out indoors at about +15C for germination. It is also possible to put soaked seeds in open dishes and place in a fridge for 2-3 months.
Then place at temperature at about +15C for germination.
Thin out only young plants (taproot).
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