agreed. anticipate growth once switched to 12/12.

for soil i use rule of thumb... one gallon of soil per month of anticipated life of plant.

although for moms, you can prune roots, bonsai style, and keep using a 2 or 3 gallon pot. depending on how long you let your moms live.

you COULD use one 3 gal, and try a larger pot for 2nd plant, and check dirt after harvests.