A garden this size produces way too much vegetative waste to be processed by the quantity of worms present in the bin, so students set up a three bin turning system for compost. Materials are stacked in one bin until it is full, preferably with layers of diverse materials and water being added. Then another bin is filled. By the time the second bin is filled, the first pile is forked over into the remaining empty bin. This turning aerates and mixes the materials, also enabling outside materials to reside in the center of the pile where they will be exposed to higher temperatures from action of the thermophilic (heat-loving) bacteria. The process is repeated---turning, emptying, filling, and finally, spreading the compost.