How to Prune Rocky Mountain penstemon?
Deadhead after flowering to maintain vigour and prolong flowering, then cut back to 15cm in late winter or early spring
Rocky Mountain penstemon · Pruning
Rocky Mountain penstemon · Penstemon strictus
Also known as: stiff beard-tongue
Grow in fertile, well-drained soil in full sun or partial shade. In cold areas, protect plant overwinter with dry winter mulch. See penstemon cultivation
Watering: Light frequent watering, fully drain surplus moisture to prevent root rotSunlight: Full sunInformation to be completed