I have moss growing on my tree. In January. And I live in the desert. Okay, the high DRY desert. We don't get green stuff growing on our trees usually.
And I'm a bad apple, as I left some on my tree last fall.... and the birds didn't even get them all.
I didn't really do a good garden/yard clean up either..... but heck, it's warm enough--I can get out there this afternoon and pull weeds, etc.
I really need to prune some bushes this spring.