Only their hairdressers know ...
Well, according to the chapter The Grey Havens, the year 1420 in the Shire was a marvellous year wherein many hobbit bairns were born with "rich golden hair that had before been rare among hobbits."
We know that Sam put a grain of Galadriel's special dust when he planted new trees after the Scouring of the Shire, but how Galadriel's hair colour got mixed in with hobbit genes is not, I think, explained. Nor does the text exactly say that this hair colour derives from Galadriel, although it is easy to make a connection given how significant her hair is.
It's a mystery.
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I’ll sing his roots off. I’ll sing a wind up and blow leaf and branch away.
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