I have referred to this plant previously in this thread above
This Penstemon was grown from seed (SRGC 12/13-2921 ) sown in September 2013, labelled P. berryi which I assumed to be P. newberryi ssp berryi and I have posted it as such on the SRGC Forum in 2015 and 2016 and in the next few days it will likely be flowering again. It's a shrubby grower and the height to the top of the stems is around 60cm, the leaves are strongly toothed and have red margins. I've always been suspicious about the naming though. The leaves are nothing like the pictures I've seen of P. n. ssp berryi or indeed of P. newberryi. I suppose it could be a hybrid and if it is I would be interested in what it's parents might have been, or it may be another species.
Would be grateful for any help.
in Devon, UK Zone 9b
As a result of my cross-posting the above on the SRGC Forum a suggestion was made that my plant might be P. serrulatus. My response to this was that I had not found pictures of serrulatus with as strongly toothed leaves as my plant and neither had I see pictures or descriptions that refer to red margins on the leaves of this species.
I'm still open to help please.