30+ Leyland Cypress Branches Turning Brown. As branches die, needles turn brown at the ends of limbs. If their roots haven't spread into surrounding soil, newly planted trees need close attention to watering.
Leyland cypress trees (cupressocyparis x leylandii) are valued for their majestic height, evergreen needles and varied uses.
Even on sites of relatively poor culture, plants have been known to grow to heights of 15 metres (49 ft) in 16 years. There's not much you can do to protect the tree other than providing in early spring, remove the brown branches and your tree should bounce back. These three fungi enter into the tree during the summer months when the heat enlarges the tree's stomata (pores on the leaf) and allow entrance of the fungi. If you space your leylands too close, it may stunt the growth or starve the roots of nutrients.