How to Prune penstemon 'Beech Park'?
Deadhead after flowering to maintain vigour, then cut back to base in winter

penstemon 'Beech Park' · Penstemon 'Beech Park'
Grow in fertile, well-drained soil in full sun or partial shade. In cold areas, protect plant overwinter with a dry winter mulch
Deadhead after flowering to maintain vigour, then cut back to base in winter