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The simple physical dimensions and slow temporal dynamics of trees present unique challenges for scientists studying their growth, behavior, health, reproduction, and management. The majority of a treeRSQUOs interaction with the biotic and abiotic environments take place either in the tree's canopy or underground, beyond easy access by researchers. The simple act of obtaining 1) physical collections of relevant biotically active samples, and 2) repeated and continuous observations of physiology, growth, and behavior remains a major hurdle. Most current research targeted at the individual tree has focused on obtaining physiological measures from the main stem, like diameter growth and general water dynamics, particularly sap flow. Sap flow is a fundamental aspect of tree physiology and a necessary physiological baseline, much like blood pressure in animals. Given the fundamental shift in global cycles …