Self-sown kohlrabi don't form bulb

Community Community General Gardening Sowing and Growing Self-sown kohlrabi don't form bulb

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    gardenaholic73
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    For several years I have had no luck with my self-sown kohlrabi. Whereas the garden center-bought plants of my allotment neighbors grew decent bulbs, mine never developed a bulb at all. They were started indoors at 24°C on a very bright windowsill and hardened off in my cold frame with some temperature fluctuation. I’ve once read that kohlrabi need very stable temperatures when young. Any ideas what I can change? I’d love to grow self-sown plants because here in Germany with the supermarket / garden center plants you never know the variety. I garden on quite dry sandy soil in Berlin. Any help would be much appreciated!

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