Cal's Plant of the Week - Features a new plant every week, with photo, description, and cultural information. Previously featured plants can be selected by botanical or common name. Focus is on plants for greenhouse culture.
Chicago Botanic Garden: Ornamental Plant Development - Provides access to plant evaluation reports from the Botanic Garden's plant trials. Each report, in PDF format, provides several pages of description and photos.
Dave's Garden: PlantFiles - Database with over 80,000 plants with cultivation information and pictures supplied by member gardeners.
DenverPlants.com - This resource for gardeners in the Denver metro area includes a sizeable database of plants with photos and cultural information.
Desert-Tropicals.com - Features searchable database of thousands of plants, with basic information and often photos. Includes many succulents, herbs, and tropical fruit trees.
Dinosaur Garden Plants - Describes plants that lived during the age of the dinosaurs, with brief information, lists, and links to other resources for plants of the mesozoic era.
Findmeplants.co.uk - Garden plant finder. Searchable by garden conditions and design requirements such as flower color, size and growth habit. Search results include plant photo and summary information.
Floridata - Features hundreds of plant portraits, each illustrated with several photos, documenting the garden uses and cultural requirements of each species or cultivar.
Flowers of India - Collection of hundreds of plant photos with brief descriptions. Each of the plants grows in India, but both natives and non-natives are featured.
Foliage Plants Database - Searchable database with basic information and some photographs of plants grown primarily for their foliage. Japanese and English.
Fruits and Vegetables - Includes set of fact sheets and links from the University of Florida.
The Garden of Paghat the Ratgirl - Pacific Northwest gardener presents essays for hundreds of species growing in her garden, with personal notes, history, cultural information, and photos for each.
Gardenline - Guide to growing and caring for houseplants, vegetables, trees and shrubs. Also features common pests and a miscellaneous section. From the University of Saskatchewan Extension.
Gardenweb: Name That Plant - Forum that allows users to upload images of plants that they are trying to identify.
Garten.cz - Features a searchable, multilingual garden plant encyclopedia, with a summary of cultural and botanical information and in many cases photos.
Horticopia On-line Plant Information - Includes directory of plants, categorized by genus, includes summary cultural information and small photograph for each plant.
HortiPlex - Horticultural database with over 100,000 species and cultivars. Comments, ratings, and photos for many varieties supplied by members of the Gardenweb community.
Illinois' Best Plants - Chicago Botanic Garden provides a database of recommended plants for Illinois gardens, from perennials to trees, with photos and information on their culture and use.
New Jersey Weed Gallery - Database of weeds, accessible by common and botanical names and by a thumbnail gallery. Summary information and photos are provided for each weed.
Pacific Northwest Plants - Database on plant identification, culture and usage for the U.S. Northwest, including native and introduced species and their major varieties and cultivars.
PlantBuzz - Gardener Mark McDonough presents horticultural musings and illustrated plant studies, with particular emphasis on alliums and other bulbs for rock gardens.
Plants For A Future - Resource centre for rare and unusual plants, particularly those which have edible, medicinal or other uses. Offers a plant database, and various articles on gardening, perennials, and habitats.
Plants National Database - Online USDA database of botanical information, images, and links on plants in the USA, including crops and invasives. Search by name, geographic distribution, or other characteristics.
Plants Toxic to Animals - Resources about toxic plants from the Veterinary Medicine Library.
PlantZAfrica - Includes information about plants native to southern Africa, including hundreds of alphabetically arranged plant portraits, by the National Botanical Institute of South Africa.
Shady Character - Mark shares photos and descriptions with personal experiences growing a large number of shade plants, both perennials and woody specimens.
SunnyGardens.com - Plant encyclopedia featuring photos and short descriptions of annuals, perennials, shrubs, and trees.
Tiscali Gardening - A South African flower, plant and gardening portal with searchable plant database, photographs and information.
Translat - Translation program for botanical latin.
Virtual Plant Tags - Database of detailed descriptions and growing tips for thousands of plants, including many not commonly grown. Profiles include cultural information, assessment of landscape value, and photos for most.
WeedAlert.com - Offers a weed listing for the United States regions, primarily weeds occurring in lawns.