Scientific Name: "Orchidaceae". All orchids are perennial herbs, The scent of orchids is frequently analysed by perfumers (using headspace technology and gas-liquid chromatography) to identify potential fragrance chemicals. Almost all orchids will tolerate high temperatures for brief periods of time, as long as they get cooler at night. Some orchids require periods of time at cool temperatures to flower. but these periods should be limited. Pick your temperature range. Most homes are kept in the "warm" category, but most "intermediate" plants will do well also. Many orchids enjoy indirect sunlight: direct sunlight cases them to burn. keep the humidity of your growing room — wherever it may be — at about 60% to 80% at all times.