Success with penstemons
Some penstemons tend to be short-lived. Just like their freeflowering verbascum, snapdragon and foxglove cousins, they often flower themselves to death. Give them a bright, sunny position.
This encourages better flowering. Deadhead. This keeps flowers coming rather than setting seed. Don’t cut them back in autumn.
Wait until April and then cut back hard once you see new growth. They’re easily raised from cuttings taken between June and August. Look for new side shoots and trim below the leaf joint and pinch out any flower buds. Submerge two-thirds of
the cutting into trays of damp, coarse horticultural sand, or use a 50:50 mix of compost and sand.
Red penstemons with yellow verbascum and purple salvia