Intensely blue flowers with a tinge of purple contrast beautifully with the silvery green foliage of this hardy perennial. The long lasting blooms of Penstemon heterophyllus 'Electric Blue? appear from June through to October enticing plenty of pollinating insects to your garden. Pensetmons are renowned for their resilience, long flowering period and weather resistance. With a bushy, upright habit, this semi-evergreen perennial makes a superb addition to borders and wildlife gardens. Height and spread: 60cm (24).