Penstemon ‘Raven’ produces sumptuous dark purple flowers with white throats between June and October. For best results grow in full sun to partial shade in moist but well-drained soil. Plants may need protection in colder regions. Apply a thick mulch of well-rotted manure or compost in autumn to protect the roots. Plants can be propagated by seed but they won’t come true. For better results, divide Penstemon ‘Raven’ in spring. Penstemon ‘Raven’ has been awarded the Royal Horticultural Society’s prestigious Award of Garden Merit (AGM).
They thrive in full sun to partial shade, in moist but well-drained soil. Many varieties of penstemon are hardy in all but the harshest winters, but do move plants under cover or take summer cuttings to ensure they make it through winter.