Terry
>Anyone know how these (U. menziessii) things multiply?
U. menziessii will accept the mass of tubers being divided but I don't
think they like being slit into too small a piece. Smallest I've seen
is two tubers but more might be safer.
You can also get seed. I've cross-pollinated successfully from one
flower to another arising on the same clump.
Regards
Paul