Eryngium planum ‘Blue Cap’ seeds -(Sea Holly)


This plant is a clump-forming perennial which produces flowers in summer. They are steel-blue in colour, and appear a little like thistles on branched stems rising from a tight crown of dark green basal leaves. The flowers are excellent for picking, and the plant is a valuable summer garden filler, adding texture to the border.

In stock


This plant has large clusters of steel-blue flowers, which are somewhat prickly.
It is a valuable plant for the border or for cutting. It is excellent both as a cut flower and fresh or dried. It can be divided quite easily in early spring. It is also quite adaptable being able to tolerate hot, dry places, and salty soils . It is attractive to butterflies.

Sowing advice
Sow spring early summer late summer and early autumn.
Sow the seeds in pots or trays in good seed raising mix. Cover the seeds very thinly and keep moist at about 20 deg C. The seeds should germinate quite quickly. Keep in cooler conditions after germination occurs.

Additional information


Hardy Perennial

Common Name

Sea Holly



Maximum Height

80 cm

Number of seeds in packet

approx 30