I've already sprouted some sunflower seeds. I hope it's not to early.
Nah, if you make sure to water the ground just before it looks like there may be any temps in the 30s, and cover the plants, they'll be ok. Cutting the bottoms off of milk jugs make good cloches to put over seedlings in cold weather. and if you keep the jug lids, you can take the lids off to let heat escape during the day if the temp warms up to the 50s or so on a sunny day. For larger stuff, throwing a sheet or a burlap sack, just about anything really, to hold the humidity and warmth in around the plant and keep water from getting on the leaves to freeze, and they will be fine. We use plastic covered hoop houses in winter that are not heated, and we can keep stuff alive, if not growing, all winter as long as the plants stay covered and get water before really cold temps that dip down below freezing for us.
