space. I know people grow tomatoes in 5 gallon buckets but when I
experimented last year with growing them in 5 gallon buckets, the same
tomatoes in 5 gallon buckets produced a lot less than the ones grown in
the 20 gallon tubs.

Very true. But they will produce in 5 gallon cans, especially if
you do something like drip irrigation to help level out the water
applications.

If you're growing just one cultivar, it probably makes sense to grow
fewer plants in bigger containers. If you're growing one plant of
each of several cultivars, it may make more sense to grow in smaller
containers -- you'll get fewer fruit from each plant, but make up for it
with multiple plants.

Kay