Dunkelberger joined forces with another young talent, the landscape designer Weld Thayer Chase. Chase, who was inspired by the approach of English landscape designers as well as Frederick Law Olmsted. From 1935 to 1942, Chase planned and supervised the planting of 22,000 trees and 40,000 shrubs, protecting as many native trees as possible, fulfilling his vision that the road reflect the natural beauty of southern Connecticut. During excavation, native trees and plants, including maples and birch were preserved and replanted when the road was completed. Chase contracted for 47,700 laurels, 3,777 dogwoods, 6,459 pines, 3,095 cedars and, 2,037 hemlocks. In addition, Fairfield County garden clubs helped with the landscaping, donating thousands more flowering trees and shrubs. Upon completion of the parkway, he was asked what he had done, which to him was the greatest complement, since he wanted the landscape to look natural.