Turn old newspaper into seedling pots. They can be planted directly into the ground as the paper will eventually biodegrade. You can form them by wrapping the paper around a jam jar or similar, or there are 'devices' that can be bought to make the pots.
I want to grow an avocado tree.Cold Hardy Avocado-- If you grow your tree in a container, it will stay about feet tall. Small enough to move indoors and big enough to give you a lot of fruit. For all of us avocado/guacamole lovers!