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Hedgerow dating
Hedges that have existed for hundreds of years are colonised by additional species. This may be useful to determine the age of the hedge. Hooper's hypothesis suggests that the age of the hedge is equal to the number of woody species counted in a thirty yard distance multiplied by 110 years.
Dr. Max Hooper published his original formula in the book Hedges in 1974. This method is only a rule of thumb, and can be off by a couple of centuries; it should always be backed up by documentary evidence, if possible, and take into account other factors. Caveats include the fact that planted hedgerows, hedgerows with elm, and hedgerows in the north of England tend not to follow the rule as closely. The formula also does not work on hedges more than a thousand years old.