If I remember right, I brought a few of these plants from the rental house where we lived prior to moving here. They are a graceful, vigorous perennial with long leaf stems and small greenish-white flowers dangling underneath in spring. The flowers are subtly sweet-smelling, too, and the plants spread, but pretty politely via rhizomes and mine do not set seeds.
The best thing about these tough beauties is that they survive right next to the big Douglas fir in the yard where they are fully competing with the massive tree and ivy, as well.
For 2020, I’ll do what I always do to support these plants–nothing! They are completely self-sufficient!