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

There are about 320,000 species of plants, of which about 85% produce seeds. Green plants provide about 80% of the Earth's oxygen; and they are the basis of most of Earth's ecosystems. Plants that produce grain, fruit, and vegetables are the source of many human foods. Plants also have many other uses, as ornaments, building materials, writing materials and, notably, as the source from which many pharmaceuticals are derived. The scientific study of plants is known as botany.

Deer resistant plants are varieties of plants that deer will most likely not bother. These plants generally have a flavor, texture, or smell that repel deer. This website discusses plants and strategies to deal with deer problems in residential landscapes and gardens.

A tree nursery is a plot of land intended for propagating, cultivating, and raising all species of trees until they are ready to be permanently planted.

A smiling plant nursery employee holds a tray of nursery plants in a greenhouse.

A seed is an embryonic plant enclosed in a protective outer covering. Formation of the seed is part of the process of reproduction in seed plants. This page describes the types of plant seeds and offers seed germination tips.

A greenhouse is a structure with walls and roof made chiefly of transparent material, such as glass, in which plants requiring regulated climatic conditions are grown. These structures range in size from small sheds to industrial-sized buildings. This directory lists greenhouses and greenhouse suppliers in the USA.

Plant nurseries are agricultural organizations that propagate annuals, perennials, and shrubs, and grow them to a marketable size. Retail nurseries sell plants and garden supplies to the general public while wholesale nurseries sell their nursery stock to garden centers, commercial landscapers, and other nurseries. Private nurseries may provide for the needs of an institution or estate.

The American Society of Plant Biologists (ASPB) is a 501(c)(3) professional society devoted to advancing plant science research and education. It publishes three world-class journals and organizes conferences, and other educational activities that are key to the advancement of the science.

A nursery is a place where plants are propagated and grown to a desired age. Mostly the plants concerned are for gardening, forestry or conservation biology, rather than agriculture. This nursery directory lists plant and tree nurseries that are locate in the USA.