Allegheny County, PA Invasive Plant Rules: Prohibited Species (2026)

Landscaping shall not include any plants documented on the Pennsylvania DCNR "Invasive Plants in Pennsylvania" list. The planting of hardy indigenous species is encouraged.

C. Landscaping defined. Landscaping shall be understood to include the provision of street trees, buffer yards, replacement woodlands, and other new planted areas. Landscaping shall also be understood as the provision of undisturbed ground, where such is fully integrated into the design and layout of the subdivision or land development and preserves existing natural features of the site.

D. Street trees. All new residential and nonresidential developments shall provide street trees, in addition to any replacement trees required by § 780-506, in accordance with the following standards:

(1) Street trees shall be provided along the entire length of the street right-of-way on both sides of the street if the street lies within the development.

(2) Street trees in residential subdivisions shall be located within five feet of the right-of-way and in nonresidential developments between the right-of-way and the building line. An easement shall be granted to the municipality for the purpose of maintaining the trees, and a restrictive covenant shall be placed in the deed for the property prohibiting removal of the trees by the property owner.

(3) Street trees shall be located so as not to interfere with the maintenance of utilities, required sight distances and visibility of street and traffic signs.