Cherry Laurel Losing Leaves
I planted 5 cherry laurel trees in March 2017. I bought the trees from a local garden centre. I am not a gardener and selected cherry laurel especially for its quality of being a tough evergreen and easy to care. They were doing well until August when one of the trees suddenly got yellow and lost all of its leaves (Pic 1). I contacted the garden centre who advised to cut new grown branches and feed roots with slow releasing fertiliser. I did, but it seems that there is no sign that tree is re-covering. Is it too soon to expect new leaves to grow? Now I have another tree on the same side (Pic 1) that has become yellow and, I guess, will lose leaves too. The soil in the garden is clay and I assume it may not drain properly, however I have lavender plants in between these trees that are growing very well. Can anyone suggest what the problem is and what to do to prevent other three trees of this damage on pic 2?