Cymbidium orchids are known for their ability to tolerate a wide range of temperatures, making them a popular choice for both indoor and outdoor cultivation. However, understanding the specific temperature requirements for these plants is crucial for their healthy growth and blooming. In this article, we’ll dive into the key points you need to know about the minimum temperature tolerance, cooling requirements, and indoor/outdoor cultivation of cymbidium orchids.
Ideal Temperature Range
The ideal temperature range for cymbidium orchids is between 50°F (10°C) and 80°F (27°C). They can tolerate temperatures as low as 40°F (4°C) and as high as 90°F (32°C) for short periods, but prolonged exposure to these extremes can be detrimental to the plant’s health.
Cooling for Blooming
Cymbidium orchids require a period of cooling to initiate blooming. Night temperatures around 55°F (13°C) are necessary to set flower spikes. This cooling period typically occurs in late summer to early fall, signaling the plant to begin the flowering process.
Minimum Temperature Tolerance
While cymbidiums are not frost-tolerant, they can tolerate temperatures near freezing with some protection. However, exposure to temperatures below 35°F (2°C) can cause damage, leading to spotting on the flowers and leaves.
Indoor and Outdoor Growth
Cymbidium orchids can be grown indoors year-round, but they require a bright, cool section of the home, preferably in a south or east-facing window. They also benefit from being grown outdoors between May and early October, where they can receive bright but diffuse light and cooler temperatures.
Humidity and Ventilation
Cymbidiums require high humidity, which can be achieved with a humidifier or humidity tray. They also need good air movement to prevent fungal infections like Botrytis.
Watering and Fertilization
Cymbidiums need a moist growing medium at all times. Watering should be frequent during the active growing season and reduced during the winter. Fertilization should be done regularly, using a balanced orchid fertilizer.
Potting and Repotting
Cymbidiums thrive in a light, porous medium like New Zealand Sphagnum Moss. Repotting should be done every 1-2 years, taking care not to water the media for at least 3 days after repotting to prevent root rot.
Frost Protection
Cymbidiums are susceptible to frost damage, which can cause spotting on flowers and leaves. Protection from frost can be achieved using shade cloth, enclosed greenhouses, or added heat sources.
By following these guidelines, you can ensure that your cymbidium orchids are provided with the optimal temperature conditions for healthy growth and blooming.
References:
1. American Orchid Society. (n.d.). Cymbidium Culture. Retrieved from https://www.aos.org/orchid-care/orchid-care-and-culture-sheets/cymbidium-culture-sheet/cymbidium-culture
2. OrchidWeb. (n.d.). Cymbidium Orchid Care. Retrieved from https://www.orchidweb.com/cymbidium-orchid-care
3. OSCOV. (n.d.). Cymbidiums and Frost by Julian Coker. Retrieved from https://oscov.asn.au/articles/cymbidiums-and-frost-by-julian-coker/
4. Hydro-Orchids. (n.d.). Plant Care for Cymbidium Orchids. Retrieved from https://www.hydro-orchids.com/pc-cymbidium.html