Some good comments and observations. Once a few cells are really up, I do need to remove the plastic wrap, otherwise it would be detrimental to those emerging. I use heat mats under peppers and eggplant but this year did not do it for the tomatoes. The sun coming through the window, when it hits the plastic wrap, must cause some good heating - esp with my seeds so shallowly planted.
However, once I do remove the wrap, any cells that are not yet up do emerge. This year it was not a problem since all but a couple were up when the plastic came off.
The white flecks are the flecks of what feel like styrofoam that is immersed in the Fafard 3b mix that I use.
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Craig
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