Another insight: You don't need to grow food as farmers do. Instead of planting big crops that ripen all at once, tuck in a few seeds or transplants every few weeks so that there's a continuous food supply. You don't need long vegetable rows, either. Most edibles actually do better mixed in with different varieties or with flowering plants. Luckily, growing methods that work best for plants also mesh nicely with ways to grow a lot of food in a small space.
Shown: Lettuce is an easy-to-replenish crop that can be harvested all summer.