Penstemon may be deciduous or evergreen perennials or subshrubs, with simple, narrow leaves and racemes or panicles of bell-shaped or funnel-shaped flowers in summer and early autumn
<p>'Maurice Gibbs' is an upright, semi-evergreen perennial to 80cm tall, with mid-green, ovate leaves and narrowly bell-shaped flowers 4cm long, bright purplish-red outside, the mouth and throat white</p>