Potatoes in a potato tower or potato barrel. Big yield from a small space, grow upwards of 25 pounds of potatoes.
Gardens for Small Spaces
How to Grow Your Own Food in Small Spaces // deliciousobsessions.com
Reclaimed wood transforms a blue barrel (or ugly plastic pot) into a beautiful planter.
Free Kindle book for a limited time (download to your Kindle or Kindle for PC now before the price increases): Vertical Gardening: Grow your own Organic Vegetables, Fruits & Herbs in your City Apartment! (Urban Gardening, Vertical Gardening)
This link has a ton of really easy garden ideas.
<3 this idea of using hog-wire to create a tunnel/trellis of climbing plants/ veggies/ gourds... see next pic of gourds