Just knife holes are probably not going to be enough. Make actual HOLES, not just slits.
Holes not only provide drainage, they also allow more oxygen to get to the roots.
When I make my pots out of 3-gallon sour cream pails, I drill 3/4 inch holes with a paddle bit not only on the bottom of the pail, but also up the sides. M y plants seem very happy about it.
stinkyattic Reviewed by stinkyattic on . is it bad to grow bud in pots with no drain holes in the bottom? well is it, ? Rating: 5