www.webgarden.osu.edu : Plant information database maintained by Ohio State University.

www.ext.vt.edu/resources : Plant information database mainainted by Virginia Tech.

bluestem.hort.purdue.edu/plant : Landscape and nursery thesaurus maintained by Purdue University.

www.lewisginter.org : Lewis Ginter botanical garden website.

www.hortiplex.com : Plant information database.

www.etera.com : Plant information database and retail website maintained by Plant America.

www.luckstone.com : Website of Luckstone aggregates company.

www.vnla.org : Virginia Nursery and Landscape Association website.

www.vsld.org : Virginia Society of Landscape Designers website.