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

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/

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

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/

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/

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/

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

PlantZAfrica
- 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/

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/

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

Garden Flowers
- Descriptions of different types of flowers suitable for small gardens. Includes Phlox, Nasturtium, Lobelia Carnation, Zinnia, Alyssum, Begonia, and Dahlia.
- http://www.flowersworld.org/

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/

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/

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

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

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/

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

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/

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/

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

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/

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/

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/

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

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

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/

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/

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/

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/

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/

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/

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