I went with my daughter 2 years ago to buy some Japanese maples for her newly landscaped back garden. Of the 5, only Beni Otake is doing poorly; the rest are thriving even in full sun. Leaves and branches have being dying since spring, before heat became an issue in our gardens. There is a possibility that they have been overwatering the garden. I am worried that the tree may have verticillium although I have not cut any branches to check for a black ring. Many branches are quite dead now. Would it be a good idea now to dig it up and put it in a large pot so it will at least have good drainage? I had a rhodo once that overcame a root fungus by being moved to a better location so I'm hoping this problem may be reversible with the maple too.