The trouble with styrofoam cups is that they fall over so easily - seems like there's no kind of tray that will keep them upright when you move them around. We bought a case of round 2x2 inch peat pots, and they are hard to handle too -keep falling over everytime you even slide the tray! The aren't cylindrical, but tapered, and that makes them unstable. Very irritating! :-)
20 years ago a nursery in our town went out of business and the lady gave me a large amount of regular square, six-cell, commercial plant containers - brand new and nested. I used them for years and years until I ran-out a couple years ago. Most plastic trays are made to accomodate those. The new ones now are made of lighter plastic and difficult to reuse, no matter how careful you are.
Jack
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