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Guidelines for tapping maple trees have existed for well over 100 years. Early tapping guidelines came about when buckets (gravity collection) were the only technology available for harvesting sap. New tapping guidelines are based on years of research into maple tree growth, sap harvesting practices/technology and a recognition that tree diameter alone does not fully explain all the factors that determine if tapping intensity in a given sugarbush is sustainable. This fact sheet presents sustainable tapping guidelines.