Penstemon heterophyllus 'Heavenly Blue'
Pretty, tubular flowers that are an intriguing blend of purple and blue, appear from May to October. It’s ideal for growing at the front of a sunny border, or in pots on the patio. Plants may need protection in colder regions. Apply a thick mulch of well-rotted manure or compost in autumn to protect the roots. Ht and S 50cm