How to prune penstemon heterophyllus 'electric blue'

Mid-spring once new growth is visible; deadhead throughout the flowering season. Deadhead by cutting spent flower stems back to a healthy leaf node or lateral shoot. In spring, remove all winter-damaged or dead stems, cutting back to the fresh new growth at the base. Avoid cutting into old bare wood with no visible buds.

Light deadheading regularly; cut back annually in spring. Penstemon heterophyllus 'Electric Blue' is a subshrub that benefits from deadheading through summer and a light tidy in spring. Do not cut back hard in autumn; leave old stems for winter crown protection. In mid-spring, trim to healthy new growth. In mild, frost-free areas, a light shaping in autumn is acceptable.

Deadhead by cutting spent flower stems back to a healthy leaf node or lateral shoot. In spring, remove all winter-damaged or dead stems, cutting back to the fresh new growth at the base. Avoid cutting into old bare wood with no visible buds.