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Eryngium planum

Eryngium planum
flat sea holly
Viable seeds are plump, feathered arrowheads

Common name flat sea holly
Family apiaceae
Life cycle perennial (Z5-9)
Flowers steel blue
Size 3'
Light full sun
Cultural notes well-drained soil; drought-tolerant.
From seed give several weeks cold, then germinate at room temperature
detailed seed-starting info below

Striking! Both the flowers and the stems are blue. Good bee and butterfly plant (and wasps too, as the great golden digger wasp in the photo demonstrates). Plants are tap-rooted, and tricky to move.

Eryngium planum
Remaining rosette in December

We left this plant behind in our Pennsylvania garden (and wish it well); we don't grow it in Houston.

Read about all the eryngium species in our garden

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PlantLinks to other web pages about Eryngium planum

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Seed-starting details for this plant

  1. Seed from '06 garden. A: Baggy 70F (4w; 20%G, 7d).
    B: Baggy 35F (9w; 10%G in 9th wk) - 70F (20%G, 3d)

Cold requirement isn't so clear from the results above.

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