I've been growing a number of Cape Gooseberry (Physalis Peruviana)
plants this year from seed. In the latest edition of "Grow Your Own"
magazine it suggests that the plants can be grown as perennials and
should be pruned to give a much bigger crop in the second year.

Does anybody have any tips on how severely (or otherwise) I should be
pruning these plants and at which time of year it should be carried
out? Also, would an unheated greenhouse give sufficient frost
protection or will they require warmer conditions?