I'm in NY and I am figuring my last frost date to be around the beginning of May. I bought a bunch of seeds today and am desperate to plant something but I'm worried that it might be too early. Lavender seems to be the only one that requires quite a while to grow. Would it be too early to start them now? Also, is there an inexpensive way to warm trays? I am going to have lots of trays on 4 or 5 shelves (under lights) so buying and running a heating pad for each one is going to be costly. They are in a large "closet" in my basement so I was thinking of putting a small electric heater in there but I'm worried it might be dangerous.