I will confess up front: I have a track record of killing penstemmon.
However the two latest victims I bought in the spring last year were still alive at the end of the summer (flowers were disappointing but alive has to count for something, right?). So I took cuttings, expecting the mother plants to die (they haven't) and the cuttings to die (they haven't either).
Now I have probably half a dozen penstemmon cuttings in an unheated greenhouse, still alive. Roots poking through the bottom.
Should I rest on my laurels, and wait for their evitable demise, or is there something I should do (pot on?) to encourage them ? Or is potting on a spring time activity ?