Tree Root Collar Disorder (RCD) is a serious condition that can severely affect the health and longevity of trees. The root collar is the area where the tree’s roots meet the trunk, and it should have a visible flare just above the ground. If this flare is hidden—due to improper planting or excessive mulching—it can lead to root collar problems. When the root collar is buried, the bark, which is more similar to trunk bark than root bark, becomes susceptible to damage from excessive moisture. This constant dampness causes the bark to deteriorate, disrupting vital functions such as food transport to the roots and the movement of oxygen and carbon dioxide. As a result, the tree can suffer from reduced water uptake, root dieback, and even die. Additionally, the damaged bark makes the tree more vulnerable to infection and disease. One common manifestation of RCD is the development of girdling roots, where roots grow around the trunk and strangle it, preventing proper nutrient and water flow. Symptoms to watch for include a non-visible root flare, yellowing foliage, early leaf drop, and dieback in the upper crown. To prevent RCD, make sure to plant trees at the proper depth, avoid piling mulch directly against the trunk, and maintain proper soil levels around the root collar. If you suspect your tree has Root Collar Disorder, it's essential to consult a professional arborist to diagnose and treat the issue before it worsens.
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