I have giant bamboo in my backyard and decided to put it to good use. I also am trialling grow bags. I am gardening on top of grey water and septic systems and after 2 years I think the spot where I am growing actually has a lot of stones and cracker dust close to the surface and they heat up and it gets too hot. As a renter I decided to use grow bags instead of raised beds as they are foldable and portable. I got them fairly cheaply online and so far they are working although I am still only in the seedling stage . I am getting 30 bales of cane trash shortly that will also help protect from the summer sun. P.S better water retention in the bags, if it is a gravel pit for water drainage under my garden spot no wonder there was no moisture retention!