Nels Last year I grew about 400 plants in newspaper pots, didn't loose 1 Because of real lousy wet weather, I didn't get to transplanting till most plants were 12 to 16 in tall. You said you used newspaper on the bottom of the tray. I placed mine in the open bottom tray, like you get when buying plants, I then placed this on top of a waterproof tray. The only thing I can think of is the newspaper on the bottom did not allow for enough drainage. I added nothing to neutralize the newspaper. I also used Peters potting soil, if that makes any difference ? The only thing I can suggest is next year try a couple trays this way with non-critical plants or start a few extra.