Bosco Verticale is a towering structure, currently under construction in Milan, Italy. Once complete, the tower will be home to the world's first vertical forest. Read more: Bosco Verticale in Milan Will Be the World's First Vertical Forest
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.