Erysimum Bowles Mauve
I volunteer at an animal rescue centre once a week and they also have a memorial garden, where I have planted an Erysimum Bowles Mauve in a raised bed. Having these in my own garden, I knew them to be pretty trouble-free and very long flowering. Originally the plant in the memorial garden was doing well but on my last two or three visits, it has developed small light brown blotchy spots all over most of the leaves, although it continues to flower. Does anyone have any suggestions as to what may have caused this, and what I could do about it please?