My father told me that if you cut hair or garden grass during waning moon, they will grow slower. Is it true?

  • Does it depend on a shining moon, and the growth of grass in the light of the moon (but we never heard, that hair needs light to grow), or just on the moon phase - no matter if day or night, clouds on the sky or not? Aug 9, 2011 at 21:11
  • 1
    Maybe dad needed an excuse to not cut the grass during a crescent moon? :-O
    – Jens
    May 8, 2012 at 17:15

1 Answer 1


Of course not. Even if grass or hair would be affected by the moon phase (which I doubt), the speed with which they grow would be affected by what the phase is, not what the phase was when you cut it. Hair is dead, and the root of the hair do not know when the top was cut.

There is no references for this answer, because I can't find anyone that has researched this. :-)

  • 2
    #include "Sklivvz/needs_references.h"
    – user5341
    May 18, 2011 at 16:18
  • during my uni studies, I had to write an essay in Biology I about a scientific study on grass growing. It was literally the most boring study I have ever read, and even if I still had the reference, I would never subject anyone else to the pain of reading it. However, as a result I can contradict you. Growth rates of the studied grasses increased when the grass was cut/grazed. They did not mention moon-phases; that would have been vaguely interesting...
    – Oddthinking
    May 18, 2011 at 16:52
  • @Oddthinking: Thanks, but that doesn't contradict anything I said. :-) May 18, 2011 at 17:44
  • 2
    it appears that the trauma of reading that boring paper carefully has made me subconsciously avoid reading anything carefully ever since. :-( Sorry, you are right.
    – Oddthinking
    May 19, 2011 at 0:22
  • But, @Lennart, you're using false logic. You say that gras growth isn't affected by the moon, but what would happen if it was. To be affected, something must be different, and it is pure fantasy what that would be, and with which consequences. But from fantasy, you can conclude anything. Aug 9, 2011 at 21:16

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