perennial

Sea holly

Eryngium planum

Climate-suitable non-native

Current-climate suitability

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Future-climate resilience

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Sun

Full sun

Soil moisture

free-draining, average

Heat tolerance

Up to about 40°C

Cold tolerance

Down to about -25°C

Waterlogging tolerance

1/5

Drought tolerance

5/5

Mature size

0.5–0.9 m tall, 0.4 m spread

Seasonal interest

Summer · Steel blue

Maintenance

low

Wildlife supported

General wildlife value 4/5 (verified species relationships are shown only where structured data exists)

Known risks or warnings

Dislikes winter wet; resents transplanting.

Toxicity: none

Native status is never inferred from climate similarity. Plants restricted or invasive in a jurisdiction are excluded from recommendations there.

Demonstration data. Climate, plant and retailer records shown here are realistic samples awaiting horticultural validation and live data connections.