City addresses conflicts between gray and green infrastructure by banning new plantings of oaks and other large-scale trees; Portsmouth, VA; 4/24/09

Portsmouth leaves trees with plenty of room to grow The Virginian-Pilot - Norfolk,VA,USA
Because long-established neighborhoods such as Olde Towne, Park View and Prentis Park already have a good mix of established trees, Pittenger said, nowadays the emphasis is on maintenance and planting new trees in the right spot.
Portsmouth's tree canopy ordinance requires developers to plant a certain number of trees on each parcel they develop, based on the size of the lot and the zoning.
But these days the city doesn't allow developers to plant trees such as oaks that would grow large, Pittenger said. On Constitution Avenue in Shea Terrace, for example, many oak trees were planted under power lines.