Penstemons by hardiness

Some penstemons are hardier than others and, as a general guide, the thinner the leaves the hardier they are. If you have a sandy soil, that drains well, your penstemons will fare better through cold, damp winters than if you have a clay soil. All plant hardiness ratings are based on plants growing in the UK.

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The Royal Horticultural Society is the UK’s leading gardening charity. We aim to enrich everyone’s life through plants, and make the UK a greener and more beautiful place.