...with a little help from their friends
sounds like something out of a horror movie. In fact, it is not unusual for a tree, deprived of its trunk and foliage by lightning, disease or a lumberjack, but still possessed of roots and an above-ground stump, to continue a zombie-like existence for years—even decades. Such arboreal undead have been recognised since 1833. But surprisingly, until now, no living stump has been subjected to detailed scientific scrutiny.
Sensors fitted to the two intact trees and the stump showed that the stump’s flow of sap and water ran inversely to that of the trees. On sunny days, when the intact trees were photosynthesising extensively and drawing a great deal of water up their trunks, there was almost no water movement in the stump. At night, when the trees were no longer transpiring in this way, water flooded into the stump and sap flow reached a maximum, indicating that it was receiving a burst of resources.
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