My wife and I built a raised vegetable garden bed on our balcony. All the starter kits were 4’x4’ which are great, except when you only have a 3’ wide balcony. So we got some brackets and cedar fencing, went to town with a reciprocating saw and built ourselves a couple of 1’x3’ boxes and filled it up.
Our zucchini, radishes, and tomato plants just sprouted and the cucumbers should pop up anytime now!