Landscape Water onservation - Xeriscape ^{TM -} http://aggie-horticulture.tamu.edu/extension/xeriscape/xeriscape.html

Rainbird, The world’s leader in irrigation http://www.rainbird.com/

University of Florida Cooperative Extension Service. Basic Principles of Landscape Design. http://edis.ifas.ufl.edu/BODY_MG086

U. S. Environmental Protection Agency (USEPA)  http://www.epa.gov/

Xeriscape Colorado, Inc. http://www.xeriscape.org/

Xeriscape: A guide to developing a water-wise landscape - http://pubs.caes.uga.edu/caespubs/pubcd/B1073.htm

NYFA - New York Flora Atlas - http://atlas.nyflora.org/