This summer I'm using five gallon buckets from home depot, drilling several medium-sized holes in the bottom and using 50/50 coco coir and perlite. My plan is to dig holes for each of them and bury almost to the rim so they are much less noticeable but in perfect soil, ph, etc. after time the roots will extend through the holes in bottom too. I'm fortunate however and will be able to water every 2-3 days no prob and so am gonna use a little organic nutes too.