It is of the nature of raspberry canes to drink quite a lot of water and
spread horizontally putting up lots more canes. I would suggest a soil
surface area of around 0.25 sqm per planted cane. Depth is less of an
issue as raspberries are shallow rooting.

Steve Harris

I am VERY interested in this myself. Raspberries are my absolute favorite
summer
fruit and I don't have ground to plant them in............

A quick google threw up the following (from the gardenweb forum):

Thanks for this, Jenny. It looks fairly promising for mine anyway - I've got
it in quite a big pot, and I've only got one cane in there - plenty of
space. The thing seems to be to keep it well-watered in the summer for lots
of fruit, from what I can gather.

Good job I've ordered my council-subsidised water butt!

Andrew