White Powder On Hardy Geraniums Stems.
I've got several hardy geraniums this year that don't look too happy.
They are not new plants, they are all at least a couple of years old.
If you look at the stems some many of them are covered in a white powder which you can scrape off with your finger nail.
I had this last year but it only affected one plant.
Any idea what this is and how to get rid?