I buy now since I want mine in the spring, earliest possible. Of course my spring comes a lot sooner than most on here. There's pros and cons on waiting until spring
PROS: get a lower price because the prices may be way down by then and/or everyone has already bought them already so maybe no one will bid against you. Get a different selection of daylilies listed since there will be different sellers usually listing in the spring.
CONS: what you are wanting is sold out by everyone selling it and you can't find it anywhere.
I have paid more for daylilies than if I would have waited but then I have waited and then the plant was never listed again and I couldn't find it anywhere. Or I have waited and then had to pay more than if I would have bid the first time. You just never know with the auction.