Who We Are

Shadetree Partnership Inc. is non profit (501 (c) (3) volunteer-based organization that promotes more livable communities through the planting and stewardship of shade trees and other nursery stock.  Shadetree operates a 5 ½ acre nursery located on the campus of the University of California, Irvine where over 4,000 trees and shrubs/groundcover are currently growing.  It is at that location that enthusiastic volunteers grow, care for and nurture trees, shrubs and groundcover for planting on public lands including schools, parks, churches, and cities.  Since its formation in 1990, Shadetree has planted more than 36,500 trees and groundcover at various sites within the community. Many Orange County schools, colleges, community groups, non-profits and businesses have participated in Shadetree planting events.


Shadetree has partnered with 70+ Eagle Scout candidates to design, construct and complete their Eagle Scout Leadership projects.  We also have opportunities community service hours for volunteers at weekly Saturday nursery events as well as programs for additional involvement with our Adopt-A-Row, docent, and community service programs.

Shadetree Partnership Board of Directors

  • Mary Aileen Matheis, President and Director (Former Irvine Ranch Water District Board Member)
  • Vacant, Vice President
  • Jenny Roney, Secretary and Director (Retired Director of Human Resources, Irvine Ranch Water District)
  • Eileen Lin, Treasurer (Controller, Irvine Ranch Water District)
  • Paul Cook, Director (General Manager, Irvine Ranch Water District)
  • Ian Swift, Director (Natural Resources Manager, Irvine Ranch Water District)
  • Greg Brooks, Director (Vice President of Land Development, Real Estate Development Associates, LLC)

Legal Counsel

Claire Collins, Shadetree Partnership Legal Counsel (Hanson Bridgett)

Shadetree Partnership’s Former Ambassador

Helena Czochanski