Vertical gardening? Not sure about how the drainage works, etc… but this may work in some situations- let me know if it works for you.
clipped from zenhabits.tumblr.com
4 Amazing Vertical Garden Designs For Growing Veggies In Any Space
4 Amazing Vertical Garden Designs For Growing Veggies In Any Space
Short on space? Vertical gardening keeps things growing, keeps your vegetable plot tidy, and can help fruits ripen.
The post links to an article with 4 ideas on how you can add the vertical perspective to your patch.