The domes do a great job of keeping the top soil moist. They also fit inside standard red solo cups, and I have been using them for both the solo cups and the peat cups. So far maybe 30 seedlings planted with none lost.For my purposes the peat cups could use smaller drain holes, though. I find the cups have a little too much drainage for their size, and I have to water them daily when they are sitting under the hot lights.
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