If you cut them too soon, they are too dry by March 17th which is when I plant. I usually wait until March 1 to start cutting mine. I cut chunks to there are at least two eyes and then turn them upside down in open egg cartons to dry. I've been out in the barn...had frozen water in some cups so I added another light between two cages. Also spent time combing hay and putting out new hay for tonight. Filled all the feeders and water jugs and set out some rubber tubs of water also. Put toe sacks on the sides of the pens set in the barn to help hold more heat. I still want to drop one of the heat lamps in the hen house by 1.5 feet over the roost. And I'm going to unplug the other one from the timer and lower it. Hope to keep the big water containers from freezing. I still need to bring in extra med chick feed from the barn for the chicks in the hot tub room...don't want to have to walk on ice if they run low. The soil should be sterilized. You can either buy it or sterilize it in aluminum trays in the oven at 250 degrees for two hours. Let it cool before using. Also you may be watering the seedlings too much and there isn't enough air circulation. I use Benomyl spray on my seedling. It helps with "damping off" the condition where the seedlings get fungus at the soil line and simply fall over. You can get it at Walmart or most hardware stores. I mix it into a little pump sprayer like a hairspray bottle.