This year I started some toms in used 4" square green plastic pots and also in new 16oz. styro cups, all using the same soil blend, same time and seedling batch. It seemed kind of odd, as there was no apparent reason, but the ones in the stryo cups were slower overall. Both in germination speed and growth after sprouting.
I had some duds and a few great successes in both types of pots, but the results were such that I probably won't be using any stryofoam cups next year. Besides being slower growing, they were tippy and didn't fit well in my flats.
-Ed
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