From what I can see of my Geranium sanguineum (sp?) they slowly spread by roots offsetting. I haven't had Roxanne long enough to see her do that, but I assume she will. With my other plant I thought I'd just detach the plantlet with as much root as seems necessary and replant where I want it.... but that means I don't have to dig the whole plant up, either.
Hope this helps some!
