we grow things like lettuce, radish and spring onions in flower troughs, about 8" deep, they don't need too wide a container,
toms go outside in the famous morrison's 8 for 99p buckets,
coriander and rocket, I suppose the same as the lettuce..we let the rocket go to seed for seeds and hoverflies..never grow rocket, it goes to seed too quickly, doing something wrong, I suppose..we go for oriental veggie mix for stir fries ;D