Penstemon heavenly blue Supplied as cutting raised Jumbo plug Penstemons are one of the most valuable late-summer perennials and are normally in full flower from June to the first frosts. They perform best in well-drained soil and in full sun but will enhance a partially shady spot producing slightly less flowers. Regular deadheading throughout the summer will extended the flowering season followed by a light prune during the autumn. When the new shoots appear in the Spring, and the possibility of heavy frost has passed, hard prune the plant to the new growth. This pruning is essential to maintain the shape and vigour of the plant. Growing on Pot up plug plants into 9cm pots and grow them on in frost free conditions until large enough to plant outdoors. acclimatise them to outdoor conditions over 7 to 10 days. Transplant outdoors in fertile, well drained soil that remains reliably moist throughout summer. Choose a a sunny spot Plugs bought from end of April onwards can be planted straight into garden in prepared ground
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