Plants

Offers a weed listing for the United States regions, primarily weeds occurring in lawns.

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.

Plant encyclopedia featuring photos and short descriptions of annuals, perennials, shrubs, and trees.

Extensive information about plants native to southern Africa, including hundreds of alphabetically arranged plant portraits, by the National Botanical Institute of South Africa.

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.

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.

Gardener Mark McDonough presents horticultural musings and illustrated plant studies, with particular emphasis on alliums and other bulbs for rock gardens.

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.

Horticultural database with over 100,000 species and cultivars. Comments, ratings, and photos for many varieties supplied by members of the Gardenweb community.

Features a searchable, multilingual garden plant encyclopedia, with a summary of cultural and botanical information and in many cases photos.

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.

Weblog-style source of information on various garden plants, fruits, and vegetables. It is the English-language companion to the French aujardin.info.

Pacific Northwest gardener presents essays for hundreds of species growing in her garden, with personal notes, history, cultural information, and photos for each.

Descriptions of different types of flowers suitable for small gardens. Includes Phlox, Nasturtium, Lobelia Carnation, Zinnia, Alyssum, Begonia, and Dahlia.

Collection of hundreds of plant photos with brief descriptions. Each of the plants grows in India, but both natives and non-natives are featured.