Yes, Emily, heirlooms wintersow well, too. For wintersowing purposes, it's pretty much a tomato is a tomato is a tomato. A zinnia is a zinnia is a zinnia, etc
There are just a few exceptions to that. Sometimes, within a given genus or species plants can vary a lot.
e.g. euphorbia- there are some that are hardy to a given zone, while others are annual. So it helps to know what you have to start with.
Karen
