The answer to 'tree trimming not growing' is that there are several common causes, including improper trimming techniques, nutrient deficiencies, or underlying health issues with the tree. Symptoms may include stunted growth, sparse foliage, or discolored leaves. To solve the problem, it's important to first diagnose the root cause and then take appropriate action.
If the issue is due to improper trimming, such as cutting too much of the tree or making improper cuts, you may be able to correct this yourself with some research and care. However, for more complex problems like nutrient deficiencies or disease, it's best to consult a professional arborist who can properly assess the tree and recommend the right treatment.