I don't know.

But I do know that the bigger the pot, the better the chance of getting an LB.

And my guess is that 1-2 lbs is about the max a 5 gallon container can give...

You also have to remember that the season can be long outside and 5 gallons may not be enough.. you could get root bound... alos the plant can and will get so big that a 5 gallon pot can and will fall over.