Horticulture is the art of cultivating plants in gardens to produce food and medicinal ingredients, or for comfort and ornamental purposes. Horticulturists are agriculturists who grow flowers, fruit and nuts, vegetables and herbs, as well as ornamental trees and lawns. The study and practice of horticulture have been traced back thousand of years. Horticulture contributed to the transition from nomadic human communities to sedentary, or semi-sedentary, horticultural communities. Horticulure is divided into several categories which focus on the cultivation and processing of different types of plants and food items for specific purposes. In order to conserve the science of horticulture, multiple organizations worldwide educate, encourage, and promote the advancement of horticulture. Some noble horticulturists include Luca Ghini and Luther Burbank. Horticulture involves plant propagation and cultivation to improve plant growth, yields, quality, nutritional value, and resistance to insect