Craig,
Have you ever tried an undivided germination tray? I used them this Spring with good result, but I wasn't planting very densely. I will be planting more densely this year and think the undivided tray will work out just fine. The plants tease out rather easily, since the trays are shallower than a divided tray.
Also, do you know off the top of your head the difference between MetroMix 360 and 350? My local greenhouse supplier carries 350, and I've been happy with it, so far, but I don't have nearly the experience that you do.
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