These beautiful orchids produce long, graceful sprays of flowers that are typically white, lavender or a combination of the two during the fall and winter. Flowers may remain open three to four weeks. The general culture of dendrobium is discussed here, although there are many different types, each having slightly different cultural requirements. Orchids require a temperature similar to other houseplants and must be protected from cold weather. Avoid placing your plants near a window during extremely cold weather.
Most orchids require partial shade for best flowering and growth.
A southern exposure is usually the best exposure for providing bright, filtered light. Light levels that are too low are one of the main reasons orchids can fail to flower and are evident by leaves that are a very dark green. They perform best in a bright window with little or no direct sun, such as an east window. Artificial light can be used as a sole source of light for phalaenopsis orchids or to supplement natural light. Four 4-foot long fluorescent tubes placed in one fixture that is 6 to 12 inches over the leaves should be satisfactory.