In the landscape
Border · Specimen · Container · Patio · Rock wall · Slope · Small space · Butterfly
Data sources
Sea Holly
Eryngium planum · Perennial
Sea Holly is a perennial, hardy in USDA zones 5-9, that matures to about 2–3 ft × 1–2 ft. It does best in full sun with low water needs in well-drained, occasionally-dry and very-dry soil. Expect blue, silver and purple blooms in summer and fall. It attracts bees, butterflies and pollinators, stands up well to deer, drought and dry soil and grows happily in containers.
- USDA zones
- 5-9
- Sun
- Full sun
- Water
- Low
- Mature size
- 2–3 ft × 1–2 ft
- Maintenance
- Low
- Soil
- Well-drained, Occasionally-dry, Very-dry
- Bloom color
- Blue, Silver, Purple
- Bloom season
- Summer, Fall
- Attracts
- Bees, Butterflies, Pollinators
- Tough against
- Deer, Drought, Dry soil, Poor soil, Rabbits, Salt
- Native to
- Central and southeastern Europe
Will it survive your winters?
We score Sea Holly’s freeze-trouble range against the real coldest nights your area has recorded.
Powered by ~35 years of daily lows from the nearest NOAA weather station. A risk read, not a guarantee — a sheltered spot or mature plant beats the odds.
More plants for your zone: Zone 5 · Zone 6 · Zone 7 · Zone 8 · Zone 9
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