The native Penstemon on my property is P. jamesii. A white one started opening today. It is quite striking and I'd like to propagate it. Does anyone have experience self-fertilizing penstemons? Should I isolate it with shade cloth? Try fertilizing it with a paint brush? Am I likely to develop a white seed strain? Should I just let the bees do their thing?
I've noticed that some Penstemons aren't self-fertile, so am apprehensive about interfering in the process. :-\