Hi, DonnaMarie!
My celery just popped up yesterday from a 2/9 sowing- I never soak seeds ahead. Like Bower said don't cover except with the finest bit of material and keep in a lighted place. I had mine on top of a fluorescent fixture that was on 16 hrs./day for onions, parsley and mini-dwarf tomatoes. With things that like cool weather, I avoid heat mats because mine tends to make the soil really hot. I keep them on the mantel over the wood stove or on the slate surround or on top of lights and it's plenty warm. If you have a sunny window, a covered tray can stay pretty warm during the day already, too. Everything still needs a light at germination so as not to get leggy.
kath
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