maxjohnson, we (My adult son and I) are growing carrots in 5 gallon buckets this winter. He is growing carrots in three buckets. He used MG potting mix in one bucket and the other two have different amounts of Earthgro potting soil mixed in. The Earthgro is pretty dense and has sand as a major ingredient. He got his three buckets ready a week ago. So far, there is a 1F degree difference. The straight MG is slightly warmer.
For my part of the experiment, I went with one bucket of Pennington potting mix, one bucket of MG raised bed soil, and one 50/50 mix bucket. I just started yesterday and have not put a thermometer in it yet.
Neither of us has planted carrot seeds or fertilized yet. The ground/bucket soil temperature is still too hot. I am thinking that adding fertilizer could raise soil temperatures a little. I don't know, the experiment/s are just getting started.
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