Plants

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.
http://www.gardenline.usask.ca/

About.com: Poisonous Plants for Cats, Dogs, Humans - Article listing a number of poisonous plants, with links to further information about those plants.
http://landscaping.about.com/od/poisonouslandscapeplants/

Translat - Translation program for botanical latin.
http://members.ozemail.com.au/~pbostock/

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.
http://www.plants.usda.gov/

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.
http://www.flowersofindia.net/

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.
http://www.pfaf.org/

Fruits and Vegetables - Includes set of fact sheets and links from the University of Florida.
http://edis.ifas.ufl.edu/TOPIC_Fruits_and_Vegetables

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.
http://www.paghat.com/

SunnyGardens.com - Plant encyclopedia featuring photos and short descriptions of annuals, perennials, shrubs, and trees.
http://www.sunnygardens.com/

WeedAlert.com - Offers a weed listing for the United States regions, primarily weeds occurring in lawns.
http://www.weedalert.com/

PlantBuzz - 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/

Foliage Plants Database - Searchable database with basic information and some photographs of plants grown primarily for their foliage. Japanese and English.
http://albinopri.cool.ne.jp/leaf/en/

Gardenweb: Name That Plant - Forum that allows users to upload images of plants that they are trying to identify.
http://forums2.gardenweb.com/forums/namegal/

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.
http://www.chicagobotanic.org/research/plant_evaluation/

All America Selections Winners - Showcases new varieties of flowers, vegetables, and plants for garden performance.
http://www.all-americaselections.org/

Garten.cz - Features a searchable, multilingual garden plant encyclopedia, with a summary of cultural and botanical information and in many cases photos.
http://www.garten.cz/

DenverPlants.com - This resource for gardeners in the Denver metro area includes a sizeable database of plants with photos and cultural information.
http://www.denverplants.com/

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.
http://www.dinosaurgardenplants.com/

BackyardGardener.com: Garden Guides on Plants - Starting point for information on (types of) plants, with summary information for many species and varieties.
http://www.backyardgardener.com/plants/

Desert-Tropicals.com - Features searchable database of thousands of plants, with basic information and often photos. Includes many succulents, herbs, and tropical fruit trees.
http://www.desert-tropicals.com/

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.
http://www.virtualplanttags.com/

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.
http://www.bestplants.org/

HortiPlex - 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/

Echo: Fruiting Trees, Shrubs, and Herbaceous Plants - Features cultural information, uses, handling tips, and links for an extensive list of fruits and vegetables.
http://www.echotech.org/mambo/index.php?option=com_content&task=view&id=95

The Families of Flowering Plants - Offers descriptions, illustrations, and identification retrieval.
http://delta-intkey.com/angio/

Tiscali Gardening - A South African flower, plant and gardening portal with searchable plant database, photographs and information.
http://new.mweb.co.za/gardening/

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.
http://njaes.rutgers.edu/weeds/

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.
http://www.plantoftheweek.org/

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.
http://www.findmeplants.co.uk/

Plants Toxic to Animals - Resources about toxic plants from the Veterinary Medicine Library.
http://www.library.uiuc.edu/vex/toxic.htm

Floridata - Features hundreds of plant portraits, each illustrated with several photos, documenting the garden uses and cultural requirements of each species or cultivar.
http://www.floridata.com/

Shady Character - Mark shares photos and descriptions with personal experiences growing a large number of shade plants, both perennials and woody specimens.
http://www.mailbag.com/users/mnofsing/shad.html

PlantZAfrica - Includes 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/

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.
http://pnwplants.wsu.edu/

Horticopia On-line Plant Information - Includes directory of plants, categorized by genus, includes summary cultural information and small photograph for each plant.
http://www.horticopia.com/hortpix/

Dave's Garden: PlantFiles - Database with over 80,000 plants with cultivation information and pictures supplied by member gardeners.
http://davesgarden.com/guides/pf/

Perennials, Annuals and Bulbs - November Tips - Instructions on planting in the fall, including some specific intstructions about tulips. From the Virginia Coooperative Extension.
http://www.ext.vt.edu/departments/envirohort/monthlytips/november/notenovh.html