Plant Info Sites

Turf types, lawn maintenance advice, etc
http://www.american-lawns.com/

Database of landscape plants.Searchable by plant name, characteristics, culture, etc.
http://www.hort.uconn.edu/plants/

Sustainable Landscaping. Includes a database of landscape plants.
http://www.sustland.umn.edu/plant/

Gardener's Community Subscription site with bulletin boards & great information.
http://davesgarden.com/