Genus guide
Eryngium — 19 species
Part of the Carrot & parsley family family (Apiaceae)
Eryngium, commonly called sea holly, is a genus of spiny-bracted perennials and biennials prized for their striking steel-blue or silver flower heads. Cultivars such as 'Blue Hobbit', 'Big Blue', 'Picos Blue', and the towering 'Silver Ghost' bring sculptural drama to borders from midsummer onward. They demand full sun — at least six hours daily — and thrive in poor, well-drained soils; established plants are highly drought-tolerant and rarely need supplemental watering. All species in this genus are toxic to cats and dogs, so plant them where pets cannot graze.
All Eryngium species we cover
- Agave-Leaved Sea Holly
- Alpine Sea Holly
- Amethyst Sea Holly
- Beautiful Sea Holly
- Culantro
- Eryngium 'Jade Frost'
- Eryngium × zabelii 'Big Blue'
- Eryngium bourgatii 'Picos Blue'
- Eryngium giganteum 'Silver Ghost'
- Eryngium planum 'Blue Hobbit'
- Flat Sea Holly
- Giant Sea Holly
- Ivory Sea Holly
- Mediterranean Sea Holly
- Miss Willmott's Ghost
- Miss Wilmott's Ghost
- Moroccan Sea Holly
- Rattlesnake Master
- Sea Holly
Eryngium — frequently asked questions
Are Eryngium plants toxic to cats and dogs?
Most Eryngium are not pet-safe. Of the 19 Eryngium species in the Growli library, 12 (63%) carry a toxic or mildly-toxic ASPCA classification and 7 are pet-safe. Always confirm the exact species on its pet-safety page before trusting it around cats or dogs.
How much light do Eryngium plants need?
Most Eryngium do best in direct sun. If yours stretches toward the window or loses its variegation it wants more light; scorched or bleached leaves mean it is getting too much direct sun.
Are Eryngium easy to care for?
Some Eryngium suit more experienced growers — several want strong light, sharp drainage or a specific seasonal rhythm. Check the individual species page for the exact regime.
How many Eryngium varieties are there?
Growli's care library covers 19 Eryngium species and varieties — browse them all above. They share a similar light, water and soil pattern, so once you learn one Eryngium, the rest follow closely.
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