Saw some cranberry plants for sale on an internet site (can't remember which one) and it mentioned something about them being "the most hardy type" does this mean that they're a bit suseptable to frost, was thinking of planing one underneath my currant bushes but don't want to have to provide any form of protection. Also, what's the crop like? Quite like the idea of being able to make my own cranberry sauce for Chrimbo but don't have a lot of space! Assume they start fruiting pretty well in about the second year like most soft fruit?