- Andropogon Associates
 - Philadelphia - Offers landscape architecture from an ecological perspective. Projects range from large-scale regional planning to small-scale intimate design. - W. D. Wells & Associates
- West Grove - Pennsylvania landscaping design company offering innovative landscape design and construction services. W. D. Wells & Associates also provides professional garden care for residential and commercial customers.
- Wallace Roberts and Todd
- Philadelphia - Providing environmental planning, urban design, landscape architecture, and architecture services.
|
