older sedum, new mildew!?!
Please, I have a 3 yr old 'Diamond Edge' Sedum that has what appears to be powdery mildew this year. I had just transplanted it this spring to a new rock garden, and this spotted discoloration appeared almost immediately with its new growth. I have had many sedum throughout my garden and have never seen such a sight; its closest neighbors, a 'Novem', a 'Vera Jameson', an 'October Daphne' and others are unaffected. I have used preventative fungacides on my garden Phlox and Beebalm in the past, but have never had this to occur on a Sedum. I am flumuxed! HELP. What is this? The plant seems otherwise healthy and has continued to grow (with every new leaf being grossly spotted). Is there a Sedum plague brewing that I need to take immediate action? and if so, what? -or- Please tell me that I should not worry and next year all will be right with my world again. Thank you.