Penstemon ‘Dark Towers’

There is a faint lull in our garden in the middle of June, many summer flowering plants are poised for the next act, but right now Penstemon ‘Dark Towers’ is the show-stopper. It has been flowering for several weeks already and will continue to do so for many more to come … and it is truly eye catching. Three or four years ago I decided to test out a few different penstemons, so I bought plug plants, probably 20 or so different ones. Already, by the second season, ‘Dark Towers’ had filled the top slot, no question. It is...

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