hmmm dunno ... depense .. forgot .. will you keep it out side ? (plant it in the ground
)
my 70 days old plants (indoor) are in 7 gallon pots now (and I wish I had 9 and had repot em just before flowering)
I startet out in 1 gallon .. then 3 .. had rootbound .. then 5 then 7 .. but I also Veg for +6 weeks
if you plan on keeping them in pots do some research about soil mix .. nutriens in soil .. PH .. Epsom salt .. Lime .. micros ... rootbound and other stuff your plants will need/can help em .. and make a good mix for ther final pots/holes in the ground ..