Cells are sturdy and work great. Additional items needed: It would be great if they came with similarly sturdy bottom trays and clear covers. Using a flimsy clear plastic tray for the cells kind of defeats the point. Need something sturdy to be able to carry each tray outside during the day and back in the house at night, in addition to catching the water from the cells. Also the plants need to be transplanted, so having a larger size cell option would be great for tomatoes, squash, melon and c...