Yes, January is an ideal time to wintersow your perennials. As for tender annuals: You CAN do them any time, too. The problem arises if you get an early (e.g. March) warm weather period and the seeds sprout early. Then when the cold weather inevitably returns, your babies croak.
I usually wait until around March, depending on the weather that year, to sow tender annuals. Then if they sprout fast, I cover them with blankets for frosty nights, or even stick those jugs of tenders into the garage overnight.
Wintersowing works really well. I think you like it a lot.
Karen
