Posted: 29/04/2016 at 11:51
We've all done that one P'doc
I've got cuttings from 3 different penstemons and there are very subtle differences in the leaves if I look closely - mainly texture and length. Don't know if that might help you sort them out?
Re plant markers. I asked at Peter Beales rose nursery what they use. They use Sharpies (permanent markers). I started using them in November (black ink on white plastic) and (so far) they have not started to fade. Other than that I use a HB pencil.
For plants in the borders I am going to try black markers with silver or white pen. More expensive but it avoids the mini-graveyard look and I'm only labelling plants where variety is important. They use them a lot in posher gardens and they seem to be durable.