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Amoeba tree rings create interest of their own...

Joseph Fearn


Drury University is known to our community and visitors for our many large shade trees. We have been a Tree Campus since 2014 and take appropriate steps to maintain our campus canopy. This hasn't always been the case however. By assessing the appearance of the trees (cultural signs & symptoms) and evaluating tree age/diversity it is clear that for a period of time our precious trees were somewhat ignored -- and possibly impaired -- by less than optimal management.


One of the most important means to help maintain tree health is by decreasing mechanical damage...


But since 2011 Drury University and Drury Grounds have undertaken a significant effort to help our DU trees rebound. One of the most important means to help maintain tree health is by decreasing mechanical damage. If one looks closely at the root flare zone and surface roots of some of our trees, you can see the sign of repeated mechanical damage. Roots were scalped again and again by mowers set too low. Wounded bark calloused over only to be scalped again. This damage is still apparent on both roots and trunks.


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These pictures show repeated mower damage to surface roots and flare zone damage from mowers and/or string-trimmers.


Now we are trying a novel approach. Our crew is using the surface roots to describe interpretative, flowing tree rings to cushion and shield the tree roots. Curves are gentle enough that we can mow with larger equipment. The convolutions help demonstrate how each tree is unique, and helps to highlight the roots, making them aesthetically appealing. The large size of the mulch area provides all the routine benefits of mulch rings (water conservation, soil improvement, weed suppression, and of course mechanical protection) without the boredom that can come from endless circles on campus (after all we have over 1500 trees, if not more). These rings have gotten a good reception, and I must say, we like them too.



Letting each trees unique character dictate the shape of tree rings creates artwork rather than just geometry around some of our champion trees.



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