I have a problem with a row of hedging I have had recently planted. I’m by no means a gardening expert but I believe the type of hedging to be prunus laurocerasus. It was planted roughly 16 weeks ago. The leaves on most of the plants have turned yellow are now shedding profusely. The hedge is situated next to a wall in the back garden and the garden itself has got underlay and loose stone on top. Please see the attached photo. This was taken when the hedges were first planted. Can you think of or see a reason as to why the plants are dying? I have a dog in the garden also and I was wondering if it could be his urine thats causing the damage? Can you tell if the hedge will recover?