How to Propagate penstemon 'Bubblegum'?
Propagate by softwood cuttings, division, or layering

penstemon 'Bubblegum' · Penstemon 'Bubblegum'
Grow in fertile, well-drained soil in full sun or partial shade; in autumn, cut plants down to about a third of their height and spread a dry mulch; see penstemon cultivation for more advice
Propagate by softwood cuttings, division, or layering