Can you use roofing felt to make whale hide pots for ring culture and growing tomatoes?
i see know reason not too the pots are made from a very similar tar based material and provided it is flexible enough to form the pot shape ready to staple [use stainless staples if poss] and don’t forget to form a strap accross bottom i always use roofing felt for around the base of my brassicas to protect from cabbage root pests