Fertilizing prior to having a ice snow covered pond is a formula for a fish kill. Too much of any plant growth under ice and snow is not good and very risky.
Yeah Bill… this makes me very nervous. We had a pretty mild autumn, and the plants were growing like crazy when winter hit. Then the pond iced over quick and has been submerged since. It continues to snow, even as I type this.
I guess at this point I just keep waiting to see.
Ps. FishinRod, I have a fountain that aerates well during the summer, so the winter is the only concern.