I used the biggest can I found that was shinny. I would guess 35 gals. Right now I have about 8 plants, will keep 3 or 4 any other females will go outside when they are bigger. For outside I just plant one to a spot, drive to new spot plant, some were right next to the road but with one plant no one sees. last year I planted 6 and 2 made it big. I live in new england so when I plant them after the first 2 weeks I just leave them alone until September. I have a bad back and only need enogh to make beer with fresh bud, some oil, some 100 proof. I am still using lasts years grow but will need to buy some soon .