Zuzu, Liz lives in the San Diego area. Edited to say Google always sends me down there! Zuzu reminded me it's Redwood City area.
Hi Liz! Yep, as Zuzu says, hard to go wrong pruning the rose shrubs, I do it more for shaping.
What roses did you get in the co-op, which one is growing such long canes? My Mom has several in very large pots, the resin ones that Costco carries in the spring and they are just huge! She has to periodically root prune them to keep the roots from plugging up the drainage holes.