Does tapping harm the maple trees?
Proper tapping does not harm the tree, and the amount of sap taken from the tree is a mere fraction of the volume of sap in the tree on any given day. Trees must be about a foot in diameter before they can be tapped, and most trees can have one or two taps per season. Larger trees may have more. Many of the big maple trees in New England have been tapped yearly for well over 100 years.