- Temperature: optimum temperature range varies between 15.5-26.5 0C for most of the cultivated orchids. However, depending upon temp. requirement it can be classified as
➢ Cool Orchids (10-13 0C): Cymbidium, Paphiopedilum etc.
➢ Intermediate Orchids (13-180 C): Cattleya, Laelia, Miltonia, Oncidium, Epidendrum etc.
➢ Warm Orchids (15.5-26.50 C): Vanda, Rhynchostylis, Phalaenopsis, Dendrobium etc.
- Light: Almost all orchids require 2400-foot candle except Paphiopedilum do best in low light intensity (i.e., 800–1200-foot candle). Less light intensity required as compared to other common garden plants. Exposure to bright sunlight cause sunburn injury and is detrimental to the plants.
- Photoperiod: Most of the orchids do not responsive to photoperiod. Eight hours light induced early flowering eg in Cattleyas with additional light, delay flowering but enhance vegetative growth.
- Humidity: High RH (i.e. 70-80%) is generally preferred by most of the orchids at daytime. Monopodial type requires high RH than sympodial types. Flower buds of Cattleya are more susceptible to infection at higher RH.
- Air and CO2: Mostly cultivated and many tropical orchids are aerial rooted plants in nature so they do well when exposed to a current of fresh air. Free circulation of fresh air is also necessary to maintain the uniformity of temperature.
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