Eryngium planum, sea holly, is a drought resistant hardy perennial with striking blue thistle like flowers and bracts.
It prefers dry poor or moderately fertile soil, with full sun at least six hours a day. Over fertilisation makes them leggy and wet clay ground causes root rot.
Blooming in summer and sometimes into autumn, with deep tap roots they are useful in rock gardens, tolerant of sea spray in coastal gardens and attractive in borders where their steel blue flowers and foliage compliment vibrantly coloured summer flowers.
Looking good rising above low growing plants, or mingling amongst roses and taller perennials to provide contrast and texture.
Very popular with bees and other pollinators.
The RHS recommends deadheading until late summer then leaving flowers for interest and wildlife.
Once established it will grow to 2’6″ (75cm) high by 1’6″ (45cm) wide.
Plant Type: Hardy Perennial.
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Height 75cm |
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Width 45cm |
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Soil and watering: Dry, poor or moderately fertile. Drought tolerant. |
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Flowers: July to September |
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Position: Best results in full sun. Will tolerate part shade. |
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Hardiness: USDA Zones 4 – 9 (-34 to -1°C) |
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