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🌼 How to Care for Eryngium
How much sun does Eryngium need?
Eryngium thrives in full sun, ideally six hours or more daily. It may flower poorly and become leggy in shade.
What soil conditions suit it best?
It prefers well-drained, poor to moderately fertile soil like sandy or chalky types. Avoid heavy, waterlogged soil to prevent root rot.
How much watering does it require?
Water thoroughly after planting, then sparingly. Eryngium is drought-tolerant once established and dislikes overwatering.
Does it need feeding?
Very little feeding is needed. Too much fertiliser can cause floppy growth and fewer flowers. A light spring mulch or feed is optional.
Should I deadhead or prune it?
Deadhead faded flowers to encourage longer blooming or leave seedheads for winter interest. Cut back to ground level in early spring.
How do I plant it?
Plant in spring or autumn in well-prepared, free-draining soil. For bare-root plants, soak roots before planting and ensure the crown is level with the soil.
How should I propagate or divide it?
Propagate by seed or cuttings. Division is possible but slow to recover. Seeds may need cold stratification before germination.
Is it hardy in winter climates?
Most varieties are fully hardy in the UK but dislike wet winters. Good drainage or winter protection is advisable.
When does Eryngium flower and how tall does it grow?
Flowers typically appear from July to September. Plants grow between 60cm and 1m tall, with striking metallic blue to purple spiky blooms.