[0] Pruning [Mittleider Method] Careful pruning of certain plants can dramatically increase yields. Raise yields by removing leaves that do not support the plant or its fruit. Garden in 3-D! Use stakes, strings, and A-frames to grow plants upward instead of outward, thus conserving space. [Traditional Method] 
Pruning is something done to fruit trees, but it is never done to vegetables. Let vine crops like tomatoes, squash, and melons grow horizontally, often occupying 10-30 square feet.