I grew mine in the greenhouse last year and had a steady (if smallish) crop from 14 plants all summer long. They were kept individually in 5" or 7" pots in two of those big grow-bag trays on a trestle table across the back of the greenhouse. They were bottom-watered in the trays, but feed was direct onto the foliage.
Last weekend I re-potted them into home made compost, and was able to split some of them so that the 14 are now 22. All of the original 14 were layered from runners the year before (2004). There weren't any runners on them this time round, maybe they'll shoot this year instead? Don't know what variety they are, but they were tasty.