Penstemon Plant Care:
Best in loose, gravelly soil with good drainage. Pinching back taller varieties when about 12" tall will produce more compact plants. Can be divided every 3-4 years in spring by digging mature rhizomes and replanting. Will self sow. Foliage can be trimmed after blooming to freshen. Clean up in fall or spring. May benefit from loose winter mulch in colder zones.