Ok this probably doesn't apply in your case, but just what kind of potting mix did you use? I only mention it because about 3 years ago I bought some "potting mix" from our local hardware store and there was absolutely no way to get that garbage to retain any moisture. I don't know what that stuff was, but no way would anything grow in it. I left some in a container that got rained on, and the darn stuff floated! Still bone dry! On the other hand, I had some good quality potting mix that sat open since last year and it got dried out. All I had to do with it was fill the cells, set them in a tray full of water, and leave them overnight. Fine, no problem, and there are presently little petunia seedlings poking their heads up in it. (Black Gold, in case you're interested.
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