Hortiscope: Black knot disease can be prevented with spray
Q: I have read your comments about black knot disease on Canadian cherry trees. What routine care do you recommend to avoid this disease? The information I have on the tree says it likes sandy soil. I have very hard clay soil. Should I add sand to the soil when I plant the tree? If so, what ratio of clay and topsoil should I use? I never have grown trees before. Are there certain basics I should know about?
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