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Why did my kohlrabi not form a bulb?

  1.  Kohlrabi is very sensitive to over crowding in if too close together the plants will become stunted and not produce a bulb.
  2. Kohlrabi benefits from an application of fertilizer especially nitrogen, if they do not get enough fertilizer they can not produce a bulb.
  3. Kohlrabi is sensitive to its environment, it does not tolerate heat or lack of water. 

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