Redhand coleus4/15/2023 But then, when it came time to transplant them out to their final in-ground homes (because, afterall, they were "just flowers" and not worthy of my time to pot up), I killed a good portion of those suckers trying to get them out. And, boy, do those suckers dry out fast, even without hot Oklahoma weather. They did great coming up and I even managed to not kill most of them from drying out. LOL It was my first year using plug flats so I had no confidence. Since they were "just flowers", I didn't care if I ended up killing them. I sprouted a bunch of flowers in a 288 last year. Those cells are tiny and we're usually hardening off plants in lots of windy weather that dries out small cells rather quickly. I wouldn't attemp to harden off anything in cells that small for fear they'll dry out too quickly. ![]() You could get away with leaving seedlings in the plugs longer for plants that start with teensy-tiny seeds like petunias or begonias because their early root systems are small and stay small for a while. When the cells are that small, the roots will get cramped quickly, so I think it is always best to pot up as soon as possible. Some people pot up to larger cells or containers as soon as they have cotyledons. I only use plug flats that small for germination of small to medium (tomato or pepper-sized) seeds and then pot up to individual containers either as soon as the first true leaves appear or shortly thereafter. ![]() Other manufacturers might use different sizing. Or, at least, that's what Dillen's 288s measure. If the cell-count is 12 x 24, then you likely have 288s, which means each square would be about 0.75" x 0.75" by about 1.25" deep.
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