Associated Landscape Contractors of America
Trade association for the landscape contracting industry offers an abundance of resources for professional members and non-members. Includes a database of landscaping contractors.
Turfgrass Producers International
Nonprofit corporation to assist in and encourage through research and education the improvement of lawns and sports turf.
Irrigation & Green Industry Network
Online magazine for the professional landscape contractor, irrigation designer, golf course superintendent, landscape architect, nurseries and the green industry.