Cool, im goin to give that a trySoil that you bought would be prefered just make sure to balance the ph and cut drainage holes. But there is always of option of digging a hole thats 5 gallon size fill it will store bought and take the bucket out of the plans
NICE! im prolly going to have to find me some better soilPro-mix 3.8 compressed bails or Sunshine Mix #1. 1 bag does 2 holes, 25 gallons a piece. You can have patch like mine
https://www.rollitup.org/outdoor-growing/217201-grapefruit-x-nycd-hijack-guerilla.html#post2774188