Dry soil in my experience will make them bolt. But TBH I find radishes really temperamental - either they bolt or they don't form radishes for me, more often than not. I wondered if it was the seed source or variety? There is probably some genetic variation there as well as the environmental factors.
I've seen a radish failure at my friend's farm once too. And she's a pro, so I think in that case it was the seed.
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