Eryngium planum or sea holly blue thistle flower is an architectural garden perennial that shimmers steely blue
Sea Holly is incredibly popular with butterflies and late-season pollinators, a must for every garden in fall.
Easily germinated from seed this plant prefers to be sown direct and self-seeds freely without being a nuisance.
Eryngium is a fast-growing, long season flowering, short-lived perennial best grown as an annual that self-seeds freely.
Eryngium or Sea Holly flowers freely in full sun, and can maintain during drought conditions, stands up well to foraging wildlife, Tiny steel blue flowers appear in abundance, and create flower clusters on long wiry stems that appear largely resilient to rabbits and deer.
A spectacular display in gardens and borders, blue sea holly can be dried and holds the blue color well in arrangements.
Sow direct in late Fall or Spring.
Eryngium planum seeds can be started outdoors in the fall, or spring, or start indoors a few weeks ahead of the last frost date.
Flowering late Summer thru Fall, and loved by an array of pollinators, particularly swallowtail butterflies and bees, and plentiful seed for fall birds.
Harvested from my own pollinator-friendly plants these blue sea holly make a cheerful addition to any butterfly or wildflower garden.
Thriving on poor soils in full sun, on the prairie, or at home in the cottage garden, plant with rudbeckia, goldenrod, and fall asters.
We hand collect and clean our seeds freshly collected in 2021 seeds, sow seeds that have been kept refrigerated for 4 or more weeks to help break seed dormancy.
Easy to grow sow seeds direct where you would like them to flower, in Fall or Early Spring, approx pack quantity minimum of 10 – 100 seeds
How to grow from seed a growers guide to germination will help you get the best start for your seeds see menu for link.