The answer to 'frequency of tree removal' is that there is no single recommended frequency, as it depends on various factors. In general, trees should be inspected annually and removed if they pose a safety hazard or are severely damaged or diseased. Healthy, well-maintained trees may only need removal every 15-20 years or more. However, factors like tree species, size, location, and local climate can all influence the need for removal.
It's important to monitor trees regularly and have a certified arborist assess the need for removal. They can provide guidance on the appropriate frequency based on the specific trees on your property.