This document provides a history of horticulture and gardening from ancient times to present day. It discusses gardens in ancient Greece and Rome, the development of herbalism and medicinal plant identification in the Middle Ages, the introduction and spread of gardening in North America beginning with early colonies, and the growth of the profession through the 19th century including the work of landscape designers like Frederick Law Olmsted. It also outlines the introduction of plants from around the world, the rise of the USDA and botanical gardens, and how gardening has evolved from communities to individual homeowners by the 20th century.