Mountain laurel shrubs are generally healthy, but a few diseases can do harm to your shrub. Identify these diseases as quickly as possible to ensure that you can get your mountain laurel treated and healthy before it is too late. Below are some tips that should be able to help you to keep your mountain laurel healthy year round.
Fungal leaf spot can cause serious injury to your plant, including twig or branch dieback. It the most serious cases, it can kill your mountain laurel, especially if your plant is stressed or has been weakened. Leaf spot can be treated with chemicals.
Symptoms of winter injury can include dieback or browning of the growing tips. The bark might also split. Winter injury might be caused by too much or too late fertilization, abrupt temperature fluctuations or late spring frost. There is no way to cure this disease, though some preventative measures are listed below.
When a mountain laurel develops chlorosis, its leaves begin to yellow. This happens because your shrub is unable to absorb iron. Treat it by lowering the soil pH or using an iron chelating compound.
To prevent leaf spot, keep the area surrounding your shrub sanitized and raked clean of all leaves. Water, fertilize and prune your plant as necessary, and take steps for pest control.
Because there is no cure for winter injury, prevention is that much more important. Keep in mind that the ground will freeze during the winter, so be sure to deep water your mountain laurel before this happens. Mulch around the bottom of the plant to ensure that it retain sufficient moisture. Do not fertilize in the early fall or late summer. In the spring, sufficiently prune your shrub, but be sure to keep it safe from winter winds.
To ensure that you do not have to worry about chlorosis, make sure that your soil has good drainage and contains no alkaline.