My husband and I live in Minnesota (zone 4). We're looking at purchasing a property, but the oaks on it are suffering with oak wilt and it has sandy-loam soil. I'm wondering if I could use them to build hugelkultur beds/mounds. I'd like to build the mounds on contour to catch water flowing down the gently-sloped hill. Is there an edible fungus (shiitake or something) that would outgrow the oak wilt fungus once the trees are cut down and put into the mounds? Would the mushrooms fruit through the soil on the mound (under other edible plants and shrubs)? I don't know if I'm trying to combine too many things: building loam in sandy soil, berm and swale to manage water, hugelkultur beds, and edible fungi, while dealing with oak wilt infected trees.