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Offers a weed listing for the United States regions, primarily weeds occurring in lawns.
http://www.weedalert.com/
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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.
http://www.virtualplanttags.com/
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Plant encyclopedia featuring photos and short descriptions of annuals, perennials, shrubs, and trees.
http://www.sunnygardens.com/
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Extensive information about plants native to southern Africa, including hundreds of alphabetically arranged plant portraits, by the National Botanical Institute of South Africa.
http://www.plantzafrica.com/
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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.
http://www.plants.usda.gov/
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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.
http://www.pfaf.org/
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Gardener Mark McDonough presents horticultural musings and illustrated plant studies, with particular emphasis on alliums and other bulbs for rock gardens.
http://www.plantbuzz.com/
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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.
http://bestplants.chicago-botanic.org/
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Horticultural database with over 100,000 species and cultivars. Comments, ratings, and photos for many varieties supplied by members of the Gardenweb community.
http://hortiplex.gardenweb.com/
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Features a searchable, multilingual garden plant encyclopedia, with a summary of cultural and botanical information and in many cases photos.
http://www.garten.cz/
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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.
http://www.gardenline.usask.ca/
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Weblog-style source of information on various garden plants, fruits, and vegetables. It is the English-language companion to the French aujardin.info.
http://www.gardeningpassion.com
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Pacific Northwest gardener presents essays for hundreds of species growing in her garden, with personal notes, history, cultural information, and photos for each.
http://www.paghat.com/
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Descriptions of different types of flowers suitable for small gardens. Includes Phlox, Nasturtium, Lobelia Carnation, Zinnia, Alyssum, Begonia, and Dahlia.
http://www.flowersworld.org/
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Collection of hundreds of plant photos with brief descriptions. Each of the plants grows in India, but both natives and non-natives are featured.
http://www.flowersofindia.net/
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