How Notching Affects Sap Flow in Deciduous Trees
Notching a deciduous tree—cutting a narrow ring through bark and cambium—can reroute sap like a switch on a railroad. The practice is centuries old, yet few gardeners realize how precisely it manipulates pressure gradients inside the xylem and phloem. Done correctly, the cut becomes a temporary valve that stalls auxin flow, wakes dormant buds, and…