Penstemon leaves getting red blotches
My penstemon Raven seem to be developing these red blotches, is is anything to be concerned about? I ask because one of them got this badly (with a sort of dark aureole around the blotches, not on these ones so far) and failed to thrive...
Mountainous Northern Catalunya, Spain. Hot summers, cold winters.
Sorry to bump my own post but the red spots are spreading! Doesn’t look quite like other pics of Penstemon rust online but could it be this, or another fungal infection? I suspect fungal as all other online plants for a certain nursery got powdery mildew when plants from another nursery grown in the same conditions were all healthy...
Im not sure these plants will grow out of it, so any suggestions for treatment?
My first instinct was that it was something to do with lower overnight temperatures, but l don't suppose that applies much to you !
Is there anything on the underside of the leaves, any lurking creature?
Yes they are Raven, @B3 but definitely something moving...
Yet another pesky pest to add to my ever-growing list.
sworn the thread title was about ‘postmen's legs getting red blotches’ 🙄
Gardening in Central Norfolk on improved gritty moraine over chalk ... free-draining.