The Science and Industry of Plants, and everything associated with them; perhaps, the world's most important and innately valuable living things to human existence. Anthropologically, the cultivation of plants dates back thousands of years. Today, horticultural disciplines include: breeding, growing, crop protection, soil sciences, irrigation, nutirition, and the MORE
Many define horticulture [Wikipedia] as a subset of agriculture and the etymology of horticulture may derive post agriculture. Nonetheless, we profess that horticulture is the more encompassing term; that the kingdom Plantae is primary; and horticulture is the apex of knowledge of growing a plant or plants ["garden"]. We contend that without the cultivation of plants, there is no agriculture; that agriculture exists at the pleasure of horticulture -- whether one-plant-small, million-plant-monoculture-large, a managed forest, or to advance beneficial animals. We assert that a "garden" is one or more plant(s) being "cared for" (bred, cultivated, tended, nurtured, propagated, mass-produced, studied, sold, discussed) for either sustenance or enjoyment. Horticulture is the "science of plants" and well as "the industry of plants"; one could argue that "horticulture" represents the single-most valuable market in the world and represnts life itself (along water, perhaps).
Agriculture [Olericulture, Pomology (Fruticulture) and Viticulture]