Sea Holly
Eryngium planum
flowerAn eye-catching perennial with distinctive blue, thistle-like flower heads and spiky blue-tinted foliage that creates architectural interest in the garden. The flowers bloom from mid to late summer and are excellent for cutting and drying. This drought-tolerant plant is extremely hardy and thrives in poor, well-drained soils with minimal care.
Common Problems
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Care Guide
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Light
Full sun (6+ hours daily)
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Water
Low to moderate; water sparingly once established. Drought tolerant.
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Soil
Well-drained, poor to moderately fertile soil. Prefers sandy or gravelly conditions.
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Fertiliser
Minimal; avoid overfeeding. Optional light spring feeding.
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Temperature
Hardy perennial; tolerates cold winters and coastal conditions.
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Humidity
Low to moderate; prefers drier conditions.
Toxicity
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Non-toxic, though spiky foliage may cause minor skin irritation.
Common Diseases
Common Pests
Seasonal Care
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Resume regular watering and feeding as growth picks up.
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Peak growing season. Water and feed regularly.
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Reduce watering as growth slows. Stop heavy feeding.
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Minimal watering and feeding. Protect from frost if needed.