Growing guide

How to grow penstemons

These elegant easy-to-grow border plants send up spires of tubular flowers in a range of gorgeous colours. From sky blue to rich plum, deep purple to power pink, they flower across the summer months, and like a warm, sunny spot.

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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.