I just bought 4 juneberry for a 32 foot walkway from the house to the garage. The exact name was Amelanchier arborea. My husband and I saw this tree at the Chicago Botanical Garden. The type they had was Amelanchier Laevis 'Cumulus'. I am worried that my type is prone to mildew. Does anyone know about this type? I don't want to have a row of ugly mildew infested trees. We wanted a tree that was about 15 feet tall and not dense. Also how is the fall color for either of these?