Why the bucket.....good question. Well they were originally in 6" pots, but after topping they out grew them and became seriously rootbound. So I happend to find the big bucket in the trash, filled it with 6 gallons of pro-mix and put them in it to let those roots explore a bit. The light fixture also is the perfect size to keep the whole top of the bucket well lit . Also, I drilled holes around the top of the bucket and use them to run string thru to tie the plants down,so I have a nice even canopy. I know everyone says only one plant to a container, but its working great for me so far.