leyland cypress dying best course of action
we have 22 leylands around our fence line, most of which are looking healthy. a group of 4 have been dying from the tops down we have been removing the dead material and they are now more of a large shrub. anyway another next to these four has started dying from the top down. it is hard to tell if we are over or under watering , we have clay soil.
Is there anything we can do to prevent any future problems with the remaining healthy trees?
how often should we water? I feel along with the diseases they have they may have been over or under watered.