Directories

GardeningData.co.uk - Directory of practical gardening sites, tailored for the UK. Includes glossaries, general gardening information, and projects.
http://www.gardeningdata.co.uk/

Anything 4 Gardening - Links to gardening resources by category, most with brief descriptions.
http://anything4gardening.com/

Gardening Places - Directory of gardening websites, including seeds, catalogs, greenhouses, tools, nurseries, flowers, vegetables, organic supplies.
http://www.gardeningplaces.com/

I Love Plants - Directory of plant and garden related topics, plus links to farmer's market lists.
http://www.iloveplants.com

The Gardening Launch Pad - Features organized lists of gardening sites.
http://gardeninglaunchpad.com/

The Garden Gate - Friendly site with links to online gardening resources, and tips on using these resources to answer specific questions.
http://garden-gate.prairienet.org/

Scott's Botanical Links - Links to informational botanical sites covering a wide range of topics.
http://www.ou.edu/cas/botany-micro/bot-linx/

Garden Centers Online - Provides information about various aspects of gardening, mostly in the form of lists and tables. Also a directory of garden centers in the US.
http://www.gardencenters.com/

Garden Break Gardening Index - Links to gardening sites grouped by specific categories.
http://www.gardenbreak.com/

Weeds on the Internet - Links to websites on weeds, weedcontrol and herbicides.
http://www.ces.ncsu.edu/depts/hort/consumer/hortinternet/weeds.html

Everything Green - Information center for the lawn and landscape industry, with categorized links to hundreds of companies in the green industry.
http://www.everythinggreen.com/

Cold Climate Gardening - Home gardener in upstate New York presents her collection of annotated links to cold-gardening resources, as well as a regularly updated garden journal.
http://www.coldclimategardening.com/

The Garden Watchdog - Clearinghouse for reader-supplied reviews and contact information of thousands of mail-order and internet plant sources.
http://davesgarden.com/products/gwd/

Rock Gardeners' Last Resort - An index of plant and gardening databases, encyclopedias, glossaries, and dictionaries. Aimed at rock gardeners, but with many general-purpose references.
http://rockgardener.com/last/resort.cfm

Lawn & Garden Yellow Pages - Links to providers of garden products and services in the US.
http://www.lgyp.com/

Garden Time Online - Links to gardening resources, from planning a garden through harvest, for all types of gardens.
http://gardentimeonline.com/index.htm

Horticulture on the Internet - A large collection of links to resources on the internet for specific plant groups and other gardening topics.
http://www.ces.ncsu.edu/depts/hort/consumer/hortinternet/

Cyndi's Catalog of Garden Catalogs - Provides information for over 2000 mail-order gardening companies, including descriptions, user evaluations, and web links where available.
http://users.adelphia.net/~johnsonjames/

La-info.com - A directory of landscape and garden resources, suppliers, manufacturers and related businesses.
http://www.la-info.com/