Yes, a gallon of milk won't fit in a "one-gallon" nursery pot. Doesn't make sense, I know...

But a #5 pot's decent size for indoors. Too big for a 3-week-old plant, generally--the soil will get nasty before your plant can drink it up. When are you counting your "veg days" from? When you plant the seed? When the seedling first breaks ground?

You could grow a 3' bushy plant easily in that container--taller than that, and getting light through the canopy starts getting hard when you're growing multiple plants. So it doesn't make sense to me to try to grow them taller. Folks with plant number limits might need to grow trees. But if you're flipping them at 3 weeks a 3 gallon container should do it.(?) Maybe that's too much for me to assume, cause I don't know what plants you're dealing with or which soil you're using. I could be wrong...:hippy:

Edit...Oops...you guys posted while I was typing...
DreadedHermie Reviewed by DreadedHermie on . Soil Container size? Hey y'all. I'm trying to maximize yield on an indoor soil grow and I was told to use 5-gallon pots rather than 3-gallon. I went to the hydro store and the lady pointed out the "5-gallon" pots. After looking at them I realized they weren't actually capable of holding 5 gallons so I asked her. She said the "5-gallon" term is just a trade name and it doesn't really mean 5 gallons. It looked to me like it held maybe 3 gallons when comparing it to a typical 5-gallon bucket. So, are these Rating: 5