Greenhouse gardening involves growing plants in a controlled environment, typically within a structure made of glass or plastic. This setup allows for optimal temperature, humidity, and light conditions, which can extend the growing season and improve plant health. In a greenhouse, gardeners can cultivate a variety of plants, including vegetables, flowers, and herbs, regardless of the outdoor climate. The enclosed space protects plants from pests and harsh weather, making it easier to manage their growth and yield throughout the year.