Penstemons come into their own in late summer and then produce their spikes of foxglove like flowers freely from mid-summer through autumn until the first frosts. They can be planted at almost any time from March through to June and they can even be used as a last-minute addition in August/September. Whatever the time of planting, penstemons are one of the glories of the border in autumn which is why they feature in our collection of UK grown herbaceous plants. where you can grow them in conjunction with a softer grass such as Stipa tenuissima or interspersed between members of the daisy clan such as asters, echinacea and rudbeckia.
Penstemons love a sunny spot and will grow well in dry ground once they have settled in. The positively hate cold, wet, winter soil so drainage is a must. If your soil is heavy then either plant them on a bank or in a raised bed. Never cut them down in the autumn as the growth will help protect the plant in a cold winter so leave it intact and prune your plants back hard in late April or early May.