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witches brooms

January 29, 2013
Mike Heim, of Hayward, Wis., shows off a witches’ broom collected earlier this month in the woods north of Duluth. The brooms are genetic mutations in which the needles only grow at one-tenth to one-twentieth the rate of growth of the trees they come from. Dan Kraker | MPR Photo
Plant lovers hunt northern Minnesota for ‘witches brooms’
January 29, 2013 - 11:24pm