I know I have asked this before just can't find the link, when is the best tim to plant these in a cold greenouse, also sunburst pitty pans please
I put mine in an unheated green house about three weeks ago and they took about two weeks to pop up. Now they are growing like mad. I do have a small piece of fleece I lay over tender plants at night.
You could wait until May, but if in doubt just put one seed in a pot now.