I'm using 6in diameter pots, if I where to guess I would say 1 gallon. As far as nutes I have 3 different ones I bought Shultz plant food plus 10-15-10 and Shultz African Violet 8-14-9 also Orchid Bloom Booster 11-35-15. Because I planted them in MG soil I didn't know if it would be safe for the plants to feed them yet or even how much to use.