16+ Why Is My Leyland Cypress Turning Brown. Leyland cypress trees (cupressocyparis x leylandii) are valued for their majestic height, evergreen needles and varied uses. The leyland cypress (x cupressocyparis leylandii) has a lot going for it.
They require a lot of light for healthy growth.
Just like any other trees however, the leyland cypress is subject to diseases and take on a brown orange appearance. Physically it changes appearance by turning brown. Problems with established trees began cropping up several years ago, and the incidence of damage from disease and insect other problems occur simply because leyland cypress are often seen as the one solution for all screening needs and are planted in situations. Why are leyland cypress trees turning brown warm falls followed by cold winters can take its toll on leyland cypress trees.