Want to grow square Watermelon. Yep you read it right. If you do, find a waterproof box and use it to put a small watermelon in with the lid open so the vines can grow out, takes all season but keeps pests away and makes a great square watermelon!
All you need is a small amount of vertical space around a balcony or an open window which can hang or store a vertical array of drink bottles that can grow all your herbs and lettuce easily. Recycle as many of your plastic drink containers.