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Eryngium planum
Sea Holly
Type/Hardiness Herbaceous, Perennial, Hardy
Flowering period July-September
Height 24-36in/60-90cm
Light preference Full sun
Soil preference Moist, light
Sowing time/depth Autumn, barely cover
The steely blue flowers of this attractive plant, which appear on wiry stems with spiny leaves from July, are much loved by bees, hoverflies and butterflies.
Sowing and/or growing instructions
Direct sow in autumn, in a sunny position, thinning to about 18in apart. Alternatively, sow shallowly, covering with a little vermiculite or fine compost, in winter in a cold frame or unheated greenhouse, but plant out in final positions when quite young as this is a tap-rooted plant that resents disturbance when more mature. This plant prefers light, well-drained soil, but benefits from adequate moisture.
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