I didn't think I did, but I suppose I could have. The soil is about 1/3 potting soil, 1/3 Perlite and 1/3 pine bark with some grass clippings on the top to help retain moisture because usually it dries out really fast. Which is the same mix I use for chestnuts. Could the grass clippings be the problem? There is a nursery not to far from me and when I bought some persimmon seedlings from them they had a small amount of clippings on top, the owner said it is just to retain moisture. What is a good soil or mix for newly grafted apple/pear trees?