Use toilet paper rolls to start your plants. When ready to plant, stick the whole roll in the ground. Roll will decompose.the toilet paper rolls got moldy before the plants grew. I will stick with growing my seeds in plastic containers .
Pallet Planter with Terracotta Pots . with some hose clamps and screws to secure the pots, this old pallet has been upcycled into a feature vertical garden. For more inspiration, see 20 Creative Ways to Upcycle Pallets in Your Garden