My first attempts at the Kratky hydroponic method: 3 black buckets that have a hole drilled into each of their lids to support the plant. Back righthand: ultraviolet mustard (not looking particularly purple right now but it did when it was smaller. You can can still see the purpling on the midrib, and the leaves are about 25cm long. Back lefthand is winter purslane/lambs lettuce, well harvested. At the front is a tiny little tomato plant, about 5cm tall.