need a pic ... dont know the size ... doubt its worth an arborist ... compare to price of replacement ...

ken

Eastern plantings of Leyland may be spoiled by pest or disease problems, there has been discussion of this online.

Brown inside is due to shading unless it is showing up to an abnormal extent outside, in conjunction with reduced new growth on the outside.

If this is a sheared hedge you have to let the outside grow a little bigger each year or you eventually end up shearing a stubble.

Thanks people. Sorry, I don't have a picture nor how to put one here. I'll call a local arborist. This is not a hedge. As I posted, height is at least 2-1/2 stories high (taller than my house for sure.) It has a wonderful spread. No real competition - is on Eastern side of long narrow yard so gets noon onward sunshine. thanks for your thoughts.