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

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.

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

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

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.

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

Orchid growing in Australia, orchid flasking, Catasetinae genera, orchid stamps, and photo galleries.

Group of Thai orchid growers specializing in commercial dendrobium cut flowers. Contains information on ordering cut orchids, the orchid trade and a second for Thai orchid lovers.

Informative and in depth information on miltonia and miltoniopsis culture. Links to several other culture sites and commercial site for purchase of cultural sheets of different species.

Database presented by the London Orchid Society, with references to thousands of orchid photos and drawings in hundreds of books, magazines, and catalogs.

Features photos and cultural information.

Monthly illustrated columns on various orchid topics since 1995, as well as a photo of the month.

Software containing the data from the International Orchid Registry, allowing queries and reports to identify crosses, determine progeny of listed hybrids, and display information about natural species and intergenerics. Updated twice-yearly.

Starting point for information on (types of) plants, with summary information for many species and varieties.

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.

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.

Offers links to gardening websites arranged by plant type, with a brief description of each site.

Searchable database with basic information and some photographs of plants grown primarily for their foliage. Japanese and English.

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

Information on growing orchids, with extensive photo gallery. Emphasis on slipper orchids.