Land-grant universities should host the state extension services that conduct and support the master gardener programs in the U.S. Also listed are some Canadian sites.
Alabama
Alabama Cooperative Extension System - Home and Garden Page
Alaska
University of
Alaska Cooperative Extension Unit
Alaska Master Gardener
Arizona
Arizona Cooperative Extension Unit
Arizona Master Gardener
Arkansas
University of Arkansas
Division of Agriculture Extension Page
Arkansas Master Gardener
California
University of California Agricultural and Natural Resources Master Gardener Page
Colorado
Colorado State
University Extension
Colorado Master
Gardener
Connecticut
Delaware
University of
Delaware Cooperative Extension Service
Delaware Master Gardeners
Florida
University of Florida Master Gardener website
Georgia
University of Georgia Cooperative
Extension Service
Georgia Master Gardener
Hawaii
University of Hawaii Cooperative
Extension Service
Hawaii Master Gardener
Idaho
University of Idaho Cooperative
Extension Service
Idaho Master Gardener
Illinois
University of Illinois Extension
Indiana
Purdue
University Horticulture and Landscape Page
Purdue Master
Gardener Program
Iowa
Iowa State
University Extension
Iowa
State University Horticultural Department
Kansas
Kansas State University Extension Service
Kansas Master Gardener Program
Kentucky
University of
Kentucky Extension Service
Kentucky Master Gardener Program
Louisiana
Maine
University of
Maine Coop Extension Service
Maine Master Gardener Program
Maryland
U of Maryland Extension
Maryland
Master Gardeners
Massachusetts
University of Massachusetts Extension Service
Michigan
www.msue.msu.edu (Michigan State
University Extension)
Michigan State University Extension - Master Gardener page
Minnesota
University of Minnesota Extension Service
University of Minnesota - Master Gardener page
Mississippi
Missouri
University of
Missouri extension service
Missouri Master
Gardeners
Montana
Montana State University Extension Service
Montana Master
Gardeners
Nebraska
University of Nebraska - Lincoln Extension Service
Nebraska Master Gardener Program
New Hampshire
The University of New Hampshire Cooperative Extension
New Jersey
Rutgers
Agricultural Experimental Station - Cooperative Extension
New
Jersey Master Gardeners
New Mexico
New Mexico State University Cooperative Extension
New
Mexico Master Gardeners
New York
www.cfe.cornell.edu (Cornell
University center for the environment)
Cornell University Master Gardener Program
North Carolina
NC State
Cooperative Extension Home Page
North Carolina Master Gardener Program
North Dakota
ND State
Cooperative Extension Home Page
North Dakota Master Gardener Program
Ohio
http://extension.osu.edu/lawn_and_garden/index.php (Ohio State)
Oklahoma
Oklahoma State University Cooperative Extension Service
Oklahoma Master Gardener Program
Oregon
http://extension.oregonstate.edu/gardening/ (Oregon State University Extension Service)
Pennsylvania
Penn State Cooperative Extension (Horticulture & Gardening)
Rhode Island
University of
Rhode Island College of Environment and Life Sciences (outreach center)
URI Master Gardener Program
South Carolina
http://hgic.clemson.edu (Clemson Extension)
South Carolina Midlands
Master Gardener Association
South Dakota
SD State
Cooperative Extension Home Page
South Dakota Master Gardener Program
Texas
Texas Master Gardener Association
Texas A&M Extension
Tennessee
www.tnstate.edu/cep (Tennessee State University Cooperative Extension Program)
Utah
Utah State University Extension
Utah Master Gardener
Vermont
University of
Vermont Extension
University of
Vermont Master Gardener
Virginia
http://www.ext.vt.edu (Virginia Cooperative Extension) - Connection to Virginia's land-grant universities: Virginia Tech and Virginia State University: local extension office, educational programs, and news.
Washington
Master Gardener Program (Washington State University Master Gardener Program)
West Virginia
http://www.wvu.edu/~agexten/hortcult/master/
Wisconsin
University of Wisconsin Cooperative Extension Program
Wisconsin Master Gardener
Wyoming
University of Wyoming Cooperative Extension Program