Most restrictions governing private or public landscaping vary greatly from area to area. Anyone who plants or maintains a landscape should check governing or controlling agencies for guidelines.
Restrictions are governmental or private.
Governmental restrictions may be laws, codes or requirements. Private restrictions are usually mandated by homeowner associations or land-use requirements as a part of an ownership deed. Landscapes in new developments are often controlled by ordinance. There are several requirements in Colorado that are common throughout the state. In some areas, any overhanging branches or roots from trees or shrubs can be trimmed at the property line as long as the trimming does not adversely impact the plant.