google shows it as a z5 plant...

your name implies z4 ...

is that not an issue???

using the latin name.. really helps in search engines to find precise info ... e.g. there are umbrella pines also ...

ken

Shredded umbrella plant and astilboides are hardy in my zone 3 garden and do not go summer dormant, though they both appreciate moisture, especially the astilboides!

Terrance

I am zone 4, but sometimes I'm able to sneak in a zone 5 here and there. Does it take awhile for the shredded umbrella to fill in?

Ever tried any shade tolerant Hakonechloa grasses? I love the 'Albostriata' and the 'Aureola'. 'All Gold' is nice too and 'Ben Kaze' I'm told has pink hues in the fall. They do like moist soils as well as shade.
Hellebores have nice foliage for most of the season and have baby seedlings if you choose a good spot for them. I prune back their foliage at bloom time though for a fresh bunch of leaves in spring.
Ferns are lovely as well....Once you get started on them it becomes a disease though. So many beauties!
For bigger leaves, lungwort varieties work too...or even lady's mantle.