Some perennials require cold stratification, that's why people sow them in the middle of winter.
duane

we also sow in the winter because we can! it gets perennials and hardy annuals all finished

Bakemon-

Not sure not you meant by perennials and annuals all finished. what I'm saying is, is it possible to start late like in March and still be able to reap the rewards of winter sowing which is no lights, no hardening off business!!! The idea is the let seeds grow in an environment where they are going to be from the get go.

One nice advantage of winter sowing everything pretty much in the Winter Solstice-Spring Equinox interval is that there is little else to do in the garden, so I have time to get it done without ignoring the rest of the garden chores. This includes any annuals that can take being winter sown wth no problems. I do anything that needs cold startification first, followed by the rest of the shrubs and perennials, followed by the hardier annuals and last at the end of March into April, the basils and the zinnias, which germinate very fast and can rot in cold wet soil. All just in time to start planting out the earliest of my germinating stuff like the wallflowers.

I think that's what Bakemon is referring to.

jag---if your weather stays fairly cold thru March, then perennials that need cold stratification will do just fine. If your weather stays on the warm side they may or may not germinate. I'd say go for it. Everything else you could start in March.
Duane