![]() ![]() ![]() Then, when temperatures again rise above freezing a positive pressure resumes and sap flows out of the tree.īut this only explains why sap flows and not really why maple sap has a sweet taste. In essence, this replenishes what was lost. This allows tree roots to absorb water from the soil. If nighttime temperatures drop below freezing that positive pressure ceases and is replaced by a negative pressure, or suction, inside the tree. tapholes, broken branch stubs, frost cracks, etc). If there are any holes or openings in the tree that connect to the sapwood (e.g. When daytime temperatures rise above freezing a positive pressure develops inside a tree – forcing the sap upward from the roots toward the crown. Sap flow in maple trees is generally the result of fluctuating temperatures coupled with positive and negative pressures that develop inside a dormant maple tree in response to early spring temperatures. Michigan State University Extension explains why sap in maple trees can flow vigorously and what accounts for its unique “maple” flavor. While sap does flow in tree species other than maples, there are few species that can be tapped to produce an edible food product similar to maple syrup. This is the time of year that sap “runs” in maple trees, meaning they can be tapped to draw off the sap and boil down into maple syrup. March is maple syrup season in many parts of Michigan. ![]()
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