You can get a great, months-long harvest of ground cherries in a 3-10 gallon container. I have grown:
Ground Cherry
Cape Gooseberry
Aunt Molly's Ground Cherry
Cossack Pineapple Ground Cherry
Pineapple Tomatillo
And a few others I can't recall, all in containers.
Pineapple tomatillo is the best by far IMO. Sweetest of the bunch. Some of the above are not that great eaten out of hand