Spores, of Phycomyces spp. and other fungi, are everywhere and under the right conditions and with the right substrate will grow, so getting rid of fungi is difficult/unlikely. While you may have dug up and removed all the visible bits, if there is substrate it likes still remaining, it will likely form new growth when things are moist. Perhaps this blog will bring some lightness to the situation... New Growth: Hairy Homer :Cornell Mushroom Blog
