The root collar, or root flare is the part of the tree where the trunk transitions into the root system. This area of the tree is not part of the root system, and therefore not as resilient to prolonged soil and water exposure. This can be problematic when the root collar is buried underneath the soil, and is a common occurrence. It is common for tree’s too deep into the soil, making the root flare susceptible to soil pathogens and water damage.
Root collar disorder symptoms include yellowing of leaves, leaf necrosis and a dieback in the upper canopy. If your plant is exhibiting these symptoms, then make sure that the root collar is exposed, not in the soil. If it seems to be buried too deep in the soil, use a small spade and a brush to carefully dig it out of the soil, so the root collar is exposed with just the trunks of the root system showing. When you mulch, don’t mulch around the trees’ trunk. Taking all of this into consideration, simply provide fertilization as needed, soil amendments, and proper irrigation.
However, if the tree is exhibiting extreme root collar disorder symptoms, you may need to remove it entirely. Ask your local arborists for advice on this, or feel free to contact us.