Can anyone id this deficiency?
Hey, I have a Heritage rose that has developed some yellowing on the leaf margins, just wondering if anyone could help me out on what might be the cause? It's on random leaves all over the plant. For reference, I'm in bluegrass country KY, the plant is grafted and lives in rich soil, bit on the clay side but heavily amended with composted horse manure (we live on a horse farm there's an endless supply!) and I know the land round here is limestone rich. The plant is fed with alfalfa tea and Karl Bapst's fertilizer mix/recipe. Thanks so much!