Ive got 3 gallon and 5 gallon that i use. And a few 7s that i dont ever use really. With photperiods i start in a 1 gallon smart pot and develop a nice root ball the plant lets me know when to transplant into the 3 or 5 gallon pot. My autos i believe are in 3 gallon pots
My two white widows are in 7 gallon smart pots. I'm wondering how large these plants will get.