I Have a Wisteria tree that has shoots coming up from under the soil, but right next to the tree. I cut 2 (one was 10" tall with branches. The other was 15" the same). I planted them in a peat/sand mix and covered them with large zip lock bags. There is good drainage and moisture buildup. They have been in soil for about 10 days and I noticed mold buildup on the plants. I took the plastic off and leaves started falling off and the top of the stem has turned from medium green to brown. What have I done wrong? I have 3 more green shoots coming from the mother plant. I don't want to repeat my mistake. Please help!