The previous gardener at my home planted raspberry canes in one corner of the back yard with no root barrier. What was she thinking?!?
Over the course of the summer, the canes have gone wild, and made significant inroads on the beds to either side, as well as invading the lawn. Today I got a pretty good harvest, but let's face it, the plants are more of a pain in the ass than the berries are a reward.
Come fall, I'm going to pull out the whole mess, and probably spend the next several years pulling the stragglers. It won't be fun; they're thorny as hell.