With wide trumpet shaped flowers in a beautiful shade of purple penstemon 39juicy grape39 deserves pride of place in your garden the long45lasting blooms appear in summer above a flush of glossy semi45evergreen foliage and continue well into autumn long after other plants have started to fade penstemons are undemanding and easy to grow hardy perennials and tolerate almost any position in the garden withstand rain or drought and even resist damage from slugs height 60cm