Recently I started experimenting with using empty toilet paper paper rolls to make seed starting pots.
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Basically just turn the round tube into a square by folding it in half, lengthwise, then half again, lengthwise, to give you 4 corners. Then cut some slits in the bottom on the creases to make a box fold. Works great if you dip the bottom of the TP pot into water and let it soak for a bit, then let the pot dry overnight. Soaking the bottom in water helps the paper folds glue themselves together. I like leaving a small hole in the bottom for both drainage and maybe for using it to wick up water in a bottom watering system.
They are small pots, but maybe just the right size for certain plants to start off for a few weeks.
Empty paper towel rolls could be cut to length and make slightly larger starting pots.
Christmas wrapping paper tube rolls would work as well. Cut to length as needed.
Until recently, I just shredded up the empty tubes and used with other paper products to make paper shreds for deep bedding in the chicken coop. If the TP seed starter pots turn out to be a good idea, I think I will use them for pots instead of just more bedding. Either way, they are reused.