Dwarf mock Orange shrub
My mock orange shrub is dying from the center. Leaves turn brown and fall off. New growth is on the outside of the shrub. What is the matter with it?
Certified GKH Gardening Expert
A number of things can actually causes this. The most common is over-shearing, which leads to thick outer growth and blocks sunlight from inner branches of the shrub. Root or crown rot is another possibility, as are other diseases and pests. These articles will help with rot issues: https://www.gardeningknowhow.com/plant-problems/disease/crown-rot-disease.htm
Generally, it helps to prune out the interior, opening it up to air and light, or even some rejuvenation pruning, though this drastic measure may limit blooming next season. Here is more info on this type of pruning: https://www.gardeningknowhow.com/ornamental/shrubs/shgen/rejuvenation-pruning-tips.htm