UNITED STATES
American Horticultural Society (AHS)
www.ahs.org
Elisabeth C. Miller Library
http://depts.washington.edu/hortlib/index.shtml
Floridata
www.floridata.com
Lawn & Landscape Magazine
www.lawnandlandscape.com
Missouri Botanical Garden
www.mobot.org
National Junior Horticultural Association (NJHA)
www.njha.org
North Carolina State University
www.ces.ncsu.edu/depts/hort
Perennial Plant Association
www.perennialplant.org
The United States National Arboretum
www.usna.usda.gov
The University of Georgia College of Agricultural and Environmental Sciences Cooperative Extension Service
http://pubs.caes.uga.edu/caespubs/horticulture/info-tip.html
University of Florida (IFAS Extension)
http://prohort.ifas.ufl.edu
CANADA
Blossom Hill Nursery
www.blossomhillnursery.com
Calgary Horticultural Society
www.calhort.org
Canadian Nursery Landscape Association (CNLA)
www.canadanursery.com
Cloverleaf Garden Club
www.cloverleafgardenclub.org
Environment Canada
www.ec.gc.ca
Heritage Perennials
www.perennials.com
Hortico
www.hortico.com
Horticultural Marketing
www.hortmark.com
Landscape Ontario Horticultural Trades Association
www.landscapeontario.com
Niagara Parks' Botanical Gardens
www.niagaraparks.com/garden/botanical.php
Ontario Horticultural Association
www.gardenontario.org
Ontario Tree Seed Plant
ontariosforests.mnr.gov.on.ca/otspoverview.cfm
Ontario Trillium Foundation
www.trilliumfoundation.org
Ottawa Horticultural Society
www.ottawahort.org
Richters Herbs
www.richters.com
Royal Botanical Gardens
www.rbg.ca
Toronto Botanical Garden
www.torontobotanicalgarden.ca
University of Guelph Office of Open Learning
www.horticulturecertificates.com
University of Guelph ~ Ridgetown Campus
www.ridgetownc.uoguelph.ca
UNITED KINGDOM
The British Broadcasting Corporation
www.bbc.co.uk/learning/subjects/gardening.shtml
Royal Botanical Garden, Kew
www.kew.org/education/index.html
Royal Horticultural Society
www.rhs.org.uk/index.htm
