Eryngium planum

This is the perfect summer for Eryngium planum, and the difference between last year’s performance and this, is marked. In 2017 we had much more rain and not a lot of sun and my sea hollies produced too much lush growth, the stems flopped, and the effect was unremarkable. By contrast, this summer, the open, upright habit shows off to perfection a multitude of silvery blue flower heads (about the size of a thimble) with narrow bracts, and they are irresistible to bees, butterflies and other insects. Sun and good drainage are key, as is low fertility, so they are especially...

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