How to Propagate Penstemon smallii?
Propagate by softwood cuttings in early summer or semi-ripe cuttings in midsummer

Penstemon smallii · Penstemon smallii
Grow in fertile, well-drained soil in full sun or partial shade. In cold areas, protect plant over winter with a dry mulch. See penstemon cultivation
Propagate by softwood cuttings in early summer or semi-ripe cuttings in midsummer