Carnivorous Plants

• Carnivorous Plant Database, Rick Walker
• All About Carnivorous Plants, International Carnivorous Plant Society 

Container Gardening

• All about Container Gardening, West Virginia University Extension Service

Ferns

• All about Ferns, The American Fern Society

Flower Gardening

• Dahlias, American Dahlia Society
• General Cultural Advice, Univ. of Illinois Horticulture Solutions
• Historical Irises, Historical Iris Society
• Irises, American Iris Society
• Roses, American Rose Society

Fruits

• All about Strawberries, The Strawberry Facts Page
• All about Berries and Grapes, Northwest Berry and Grape Network
• General Cultural Advice, Univ. of Illinois Horticulture Solutions

Gardening, General

• Plant Database, Ohio State University
• Plant Dictionary, Ohio State University
• Plant Database, U.S. Department of Agriculture

Herbs

• All about Herbs, Penn State University

Houseplants

• Care of Houseplants, Alberta Extension Service
• Care of Houseplants, North Dakota Extension Service
• Selection of Houseplants, Nebraska Extension Service
• All about Houseplants, Virginia Extension Service

Lawns and Groundcovers

• Lawn and Groundcover, University of Illinois Extension Office

Organics

• Organic Vegetable Gardening, University of Florida Extension Service

Pests

• Biological Pest Control, National Integrated Pest Management Network
• Pesticides, Extension Toxicology Network
• Solutions to Pests and Diseases, Washington State University Extension Service

Regional Information

• Arid Southwest, College of Agriculture and Life Sciences, University of Arizona
• Texas, Texas A&M
• University of Arkansas Home and Garden

Rockery Plants

• All about Rockery Plants, North American Rock Garden Society

Soils and Fertilizers

• General Advice, Univ. of Illinois Horticulture Solutions

Trees and Shrubs

• Southern Trees, U.S. Forest Service. Acrobat files

Weeds