I've been looking at the forecast and temps may drop to the mid to upper 20's for the next few nights - possibly even a few snow flakes. This is my first 'real' gardening year and I've got a raised bed full of tiny cool weather seedlings - lettuce, arugula, mache, spinach, radish, turnip, beet, pea and one lone broccoli that just poked it's head up today I think I saw some leeks and carrots coming up too. Nothing is over an inch tall - most have just started coming up. Do I need to cover them? And what should I use? It's an 8x12 bed. Daytime temps should stay in the 40's so they should be okay then - I'm just worried about the nights.