One of the five raised beds in our vegetable garden hosts a tomato plant, two sweet basil plants, two hot pepper plants, four cucumber vines and a spearmint plant -- all in just 25 square feet.
To say that it's a prolific patch would be an understatement. The tomato has passed the six-foot mark and is loaded with fruit. The basils are nearly three feet tall and lush. Everything is healthy and producing, especially the cucumbers. Witness this example, picked early this morning after I'd finished the day's watering.
The vital statistics: length 9.5 inches, girth 8 inches. I don't know what this backyard monster weighs, but I found it under a particularly dense section of canopy. Ready late last week, probably, it managed to elude me for several days, and thus it grew.
Again, it came from a 25-square-foot bed.
There are so many solutions to the problem of limited space -- intensive gardening and container gardening, to name two -- that there's really no good reason (including stoopid city ordinances) not to practice sustenance-gardening skills. With a little planning, good soil preparation and regular watering, it can be done almost anywhere.