Available for purchase - a comprehensive publication on crop and soil management and pest management for farms of all sizes in Pennsylvania.

provides standardized information about the vascular plants, mosses, liverworts, hornworts, and lichens of the U.S. and its territories

An online flora of all known plants. Searchable by scientific name (It includes no vernacular or common plant names). Provides links to other database with information on that plant.

Search by scientific name, common name, or browse by family. Or run a combination search that allows limiting by state, habit, lifespan, light requirement, soil moisture, bloom time/color, and leaf and/or size characteristics.

Working toward a stronger understanding of the Mid-Atlantic flora. Includes information and images from herbaria and other sources from New York, New Jersey, Pennsylvania, Delaware, Maryland and D.C.

Searchable database of the official names adopted for use by the American Phytopathological Society

Official common names for pesticides and nomenclature data sheets for active ingredients and ester and salt derivatives.

a user moderated Q & A forum dedicated to the goal of helping people grow their own food. Select your plant from the "plant library" on the right of the screen.

Promoting and encouraging national and international interest in scientific research and education in all branches of horticulture
Includes a career paths section in the 'resources' section.

the premier society dedicated to high-quality, innovative plant pathology research
Includes a Careers section.

Provides information about agronomy in relation to soils, crop production, environmental quality, ecosystem sustainability, bioremediation, waste management, recycling, and wise land use.
Includes a Careers section.

a professional society devoted to the plant sciences, including cellular and molecular biology, genetics, development, evolution, physiology and biochemistry.

Society whose members are dedicated to the conservation and wise use of natural resources to produce food, feed, fiber, fuel, and pharmaceutical crops while maintaining and improving the environment.
Includes a Careers section.

promotes the professional practice of arboriculture and fosters a greater worldwide awareness of the benefits of trees.
Includes a careers section.

advancing the science of mycology – the study of mushrooms, molds, truffles, yeasts, lichens, plant pathogens, and medically important fungi.

Professional society promoting research, education, and awareness of weeds in managed and natural ecosystems.
Includes a careers section.

association serving the northeast states (including Pennsylvania) with research and education in weeds and their control, including herbicides, and cultural practices and chemicals for weed control.