DuPont de Nemours, Inc.

Experimental Station Laboratories

Wilmington, Delaware, United States

Certified Gold through 2022

Project Name
Project Type
Experimental Station Tree Management
ESL Education Program
Awareness & Community Engagement
About the Program
The DuPont de Nemours Experimental Station Laboratories (ESL) site is a 150-acre campus in Wilmington, Delaware, that is mostly landscaped, with some wooded buffer areas and recently designated no-mow zones. The surroundings are suburban and include a neighboring creek and a bordering state park with natural areas.

Practices and Impacts
  • The team at ESL embarked on a project to manage and maintain trees on-site since 1991, with the goal of increasing the percentage of native trees over time. Comprehensive tree monitoring surveys are completed every three years, during which the trees’ location, species, diameter, crown measurements and growth conditions are recorded, and individual trees are tagged.
  • A certified arborist maintains the trees throughout the year using techniques like trimming, mulching, treatment of pests, root invigoration, and replacing dead or dying trees with native species.
  • Since 2011, only native species of plants have been added to the site – the team manages 1248 individual trees on-campus, and of the 88 species represented, 35 are native.
  •  In 2015, several no-mow areas were designated to provide additional forage and cover opportunities for wildlife.
  • The team at ESL works to educate the site’s 1,200 employees and guests about conservation activities occurring on-site and how they can become involved. To this end, the team currently maintains several slides in the lobby slideshow documenting conservation activities on-site, and a similarly purposed section on the internal company webpage. The site manager also gave a presentation to adjacent property owners and the University of Delaware about the tree inventory mapping technology used by the team