The Metropolitan Tree Improvement Alliance

Cercis canadensis

METRIA, the Metropolitan Tree Improvement Alliance, was founded in 1976 to provide opportunities for collaboration among members in developing better trees for metropolitan landscapes.

METRIA's objectives are:

  • To provide information that will enable wiser choices of species or cultivars for particular urban environments and uses; and information about managerial techniques that will lead to healthier, more beautiful trees.
  • To develop tree cultivars having improved characteristics through breeding, selection and propagation; and preserve valuable germplasm.
  • To promote the utilization of improved cultivars and better cultural techniques.
  • Membership is open to all individuals who are willing to work in activities with the organization and representatives of any other organization that provides financial or other material support. There is no geographic restriction to membership.

The Metropolitan Tree Improvement Alliance (METRIA) hosts a Landscape Plant Symposium on "Plant Development and Utilization" at the various locations across the United States, addressing the exploration, improvement, production, marketing, and application of landscape plants.

Interspersed with tours of local flora and horticulture are sessions with featured speakers and poster presentations of original research or extension.

Proceedings from Past METRIA Conferences

METRIA 1 - Proceedings of the 1st METRIA Conference, July 27, 1976, Lanham, Md.

METRIA 2 - Proceedings of the 2nd METRIA Conference, Oct. 11-12, 1979, Cleveland, Ohio.

METRIA 3 - Proceedings of the 3rd METRIA Conference, June 18-20, 1980, Rutgers, N.J.

METRIA 4  - Proceedings of the 4th METRIA Conference, June 20-21, 1983, New York, N.Y.

METRIA 5 - Proceedings of the 5th METRIA Conference, May 23-24, 1985, University Park, Pa.

METRIA 6 - Proceedings of the 6th METRIA Conference, June 14-16, 1988, Mentor, Ohio.

METRIA 7 - Proceedings of the 7th METRIA Conference, June 11-12, 1990, Lisle, Ill.

METRIA 8 - Proceedings of the 8th METRIA Conference, June 22-25, 1994, Washington, D.C.

METRIA 9 - Proceedings of the 9th METRIA Conference, August 8-10, 1996, Columbus, Ohio.

METRIA 10 - Proceedings of the 10th METRIA Conference, September 30 - October 1, 1998, St. Louis, Mo

METRIA 11 - Proceedings of the 11th METRIA Conference, August 23-24, 2000, Gresham, OR.

METRIA 12 - Proceedings of the 12th METRIA Conference, May 23-25, 2002, Asheville, NC.

METRIA 13 - Proceedings of the 13th METRIA Conference, June 16 - 19, 2004, Lisle, Ill.

METRIA 14 - June 26-28, 2006, Chanhassen, MN.


Funding to make these proceedings available was provided by the USDA Forest Service, The National Urban and Community Forestry Council, and North Carolina State University. This website is hosted by NCSU.

If you would like to receive information on future meetings (held alternating years), please send your name and address to:

Dr. Bert Cregg, Secretary/Treasurer METRIA
Michigan State University
Department of Horticulture
East Lansing, MI 48824-1325

Current Officers and Executive Council of METRIA

Executive Director - Dr. Rolston St. Hilaire, New Mexico State University

Assistant Director - Dr. Richard T. Olsen, US National Arboretum

Secretary/Treasurer - Dr. Bert Cregg, Michigan State University

Executive Council:

Dr. Lou Anella, Oklahoma State University

Dr. Bill Baurele, Clemson University

Dr. Jason Griffin, Kansas State University

Dr. Steve Krebs, Holden Arboretum

Dr. Chris Martin, Arizona State University

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Updated February 25, 2011