Garden Guides
Gardening information and resources including articles, seasonal tips and advice, guide sheets on hundreds of plants.
http://www.gardenguides.com/

National Gardening Association
Nonprofit leader in plant-based education in schools, communities, and backyards across the country.
http://www.garden.org/

Scotts LawnService
Scotts LawnService : lawn treatments, services and products.
http://www.scottslawnservice.com/

GardenWeb
Gardening site on the Web, with garden forums, articles on gardening, directories of nurseries, gardens and gardening organizations, a botanical glossary, an events calendar...
http://www.gardenweb.com/