I have an ilex schilling hedge that is about ten years old. Earlier this past spring it started turning brown in some areas and has slowly died in those areas. Branches are bare but I can see new sprouts down inside. I cut away the dead brittle branches but it's getting to the point that it's destroying the whole hedge. I don't know if the hedge is dying or just getting too big? The spacing on the bases are about 18" apart, the depth is about 2' 6" and the height is about the same. I live on the gulf coast of Florida so water is not an issue. It gets sun from about noon time till sun set as it's on the front of my house which faces west. Any advice is greatly appreciated, thank you.