My favorite California Fuchsia, I’m still calling Zauschneria septentrionalis ‘Select Mattole’. This makes a magnificent ground cover in full sun, xeric, landscapes. Its recent shift to genus Epilobium speaks to its ‘weedy’ nature, or rather its ability to move. While it does spread I haven’t seen this or any other selection seed around here. So, yes it will move where it wants so like most any rhizomatous plant you should pay attention to what you plant it next to.