Arbor Age

Arbor Age Winter 2015

For more than 30 years, Arbor Age magazine has been covering new and innovative products, services, technology and research vital to tree care companies, municipal arborists and utility right-of-way maintenance companies

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Page 16 of 33 ARBOR AGE WINTER 2015 17 PLANT HEALTH CARE autumn pumping the water out of their cells. The water still freezes, but the crystallization occurs in the cytoplasm within the intercellular spaces, which has much less damage potential than freezing inside the cell membranes. Additionally, removing water from the cell increases the concentration gradient of solutes within the cell, which, in turn, lowers the freezing point of the cell, similar to the mechanisms mentioned earlier. The species that can best perform these tasks are those that are considered the most cold hardy and come with the reward of being able to thrive in areas unsuitable for most other living things. Even the most cold-hardy species will suffer damage from the cold if they do not acclimate to it properly. Even though water is the most damaging thing plants confront once the temps drop, it is vital to their preparation. Keeping trees well watered up until the ground freezes is one of the best ways to help them survive the coming winter. Given the proper care in autumn, and if the temps do not drop below a tree's minimum comfort range, they should be able to resume activity in the spring. If only surviving the winter was as easy for us humans. Brandon M. Gallagher Watson is creative director at Rainbow Treecare Scientific Advancements, and is an ISA Certified Arborist (#MN-4086A). Water trees even after leaf drop for better hardiness.

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