For container growers: 20 - 7 gallon grow bags for $1.09 each
(tools.woot.com)https://tools.woot.com/offers/yssoa-20-pack-7-gallon-grow-bags-1*with free shipping via amazon prime.
I've been container growing for the past 30 years or so, including when I had the bamboo nursery. Containers and growing technologies have been a major part of my life. Ignore if you have amazing soil in the ground for gardening.
