Orchids can be found growing in various environments around the world, either as epiphytes in tree tops or on rocks, or as terrestrial plants in moist ground. Epiphytic orchids are air plants that derive nutrients from debris and moisture in the air. There are two main types of orchid growth: sympodial growth with a creeping stem and monopodial growth with a single upward stem. Orchids require specific cultural conditions including suitable containers, temperatures, light levels, watering, humidity, and fertilizer to thrive. Common orchid varieties include Miltonia, Phalaenopsis, and Paphphlopedilum.