My mom. age 91, has a disappearing garden. For the past 2 years, we plant seeds which grow into pretty leafy vegetables. The next time I go out they are disappearing with large holes or totally gone overnight. I tried to replant but nothing came up. When I dug up the row, no seeds were there. It is a raised garden with sand. It is very frustrating to put in so much effort and get very little to harvest. Do you have any idea what could be causing her garden to disappear? I do see ants on the ground and we have sprayed for bugs but no help.