Download a membership application, peruse newsletter excerpts, and check the event calendar. Also read about the forms and colors of conifers.

Visit the gardener's information service, view excerpts from the American Gardener Magazine, and find membership details.

Organization devoted to the study and control of plant disease offers features, membership information and a plant pathology resource center.

Established in 1903 for the promotion of horticultural science. Includes online publications and project details.

Oldest plant association in California, known as Cal Hort, offers a monthly bulletin, an events calendar, plus a plants CD-ROM for sale.

Society offers a Connecticut wildflower photo gallery, field trip schedule, and member ship form.

Independent body represents plant science research institutes from Europe. Review bylaws and goals, or apply for membership.

Promotes global dissemination of knowledge about plant health and diseases. Find a list of pathogenic bacteria, and a newsletter.

Organization promotes the study of algae. Discover newsletters, meeting announcements and a printable membership application.