Which Orchids Are Heat-Tolerant?

Heat-loving orchids, such as Wanda, Phalaenopsis, and Ludisia, require frequent watering to prevent dehydration and can dry out mounted or potted plants. Living in high-rise buildings with large windows can also cause temperature fluctuations indoors. Mounted orchids are particularly sensitive to higher temperatures and require additional water and humidity.

High temperatures, especially in summer, can increase the risk of sunburn if orchids are exposed to too much direct sunlight. Lighter, diffused lighting can protect plants during these times. Warm-growing orchids thrive with daytime temperatures of around 26-32C (80-90F) and night-time temperatures of 18-21C (65-70F). Tropical orchids, such as cattleyas and oncidiums, tolerate summer days into the 90s, but some species may not survive in these conditions.

The recommended temperature range for “warm growing” orchids is 55º to 90ºF (12.7º to 32.2ºC), but most species can tolerate five or more. Tropical orchids thrive in heat and humidity, with some species thriving in temperatures up to 40F/4.4C or higher. Cool-growing orchids thrive with daytime temperatures of around 15-21C (60-70F) and night-time temperatures of 10-12C. Orchids start to fail when temperatures soar above 85 degrees due to extreme heat loss.

In conclusion, orchids are sensitive to heat stress and sunburn, and it is essential to choose the right orchids for their specific needs and environment.

What temperature can orchids withstand?

Orchids typically thrive in temperatures between 50° and 80° F (10° to 27° C), but occasional periods above 100° F or even in the 30s (0 C) can be harmless as long as no frost forms on the leaves. Cold injury, chill injury, and freeze injury are all types of damage caused by temperatures above and below freezing. Symptoms usually appear days after exposure to low temperatures, with the rate of development depending on the severity of the exposure and the conditions in the growing environment.

The post-exposure environment affects the degree of injury and symptom development, with the importance of post-stress handling varying with the severity of cold stress. Overall, proper post-stress handling can significantly influence the damage to plants exposed to extreme temperatures.

Can I put my orchid outside in the sun?

Orchids can be grown outdoors if the weather is suitable, with most growing in half to full shade. If moving from a greenhouse, give them one step down for sun exposure. Orchids should be watered daily, especially in climates with lower humidity, as pests and critters can be a concern.

Any orchid can be grown outside, depending on your conditions and commitment to care. It is advisable to avoid growing miniature orchids or hardy plants that cannot dry out outdoors. Instead, try growing bulky or succulent-y orchids like Cattleya, Dendrobium, or Cymbidium. In tropical climates or those that rain daily, almost any orchid can be placed outside as long as it’s in the right space.

Nearly all orchids should be grown in half to full shade, with plants moving from a greenhouse one step down for sun exposure. If plants are full sun plants in the greenhouse, place them outside in part-shade, if they are part shade, or in full shade. Ensure they are in an area easily watered when it doesn’t rain and where creatures like squirrels can’t get to them.

Automated sprinkler systems can greatly reduce watering work, and outdoor plants should be watered daily, regardless of region. In drier climates, consider watering twice a day.

Can orchids tolerate full sun?

Orchids require varying amounts of sunlight for flower production, with some requiring full sun for the entire day and others preferring indirect or dappled light. The time of year also plays a role, as the sun’s position changes over 12 months. Oncidiums like Spaghettis and Equitant require bright light, while Oncidesa, Phalaenopsis, and Cattleya thrive in semi-shaded conditions. Therefore, the ideal light conditions for your highrise garden depend on your specific orchid species.

What happens if an orchid gets too much sun?

Orchids can suffer from yellowing leaves, premature loss of foliage, sunburn, and shriveled pseudobulbs if they get too hot. To prevent these issues, ensure proper hydration and increase watering frequency. Orchids can survive winters, as they are adaptable and resilient plants. Bring them indoors before frost arrives. Care tips include avoiding extreme temperatures below 50°F, bringing them indoors, and maintaining their health and beauty.

Can orchids grow in hot climates?

Love Orchids, a Hampshire-based nursery, offers orchids for various occasions, including summer. To grow them, they recommend adding extra water, plant food, and a position away from direct sun. Orchids can flower for months and last for years, and there are various types to choose from. During the Covid pandemic, the nursery struggled to find customers, so they switched to selling online. They have since continued to create beautiful orchid gifts for various occasions. To stay updated on their orchid offerings, sign up for their newsletter, as they offer them to their Orchid Club at cost price to help them find homes.

How much sun is too much for orchids?

Orchids require six to eight hours of indirect sunlight daily for optimal growth. Direct sunlight can cause sunburn, resulting in white spots and dark rings. To protect your orchid, use filtered light like a sheer curtain and keep it in a north- or east-facing window. If you lack access to these windows, keep your orchid several feet back in rooms with south and west-facing windows. Water your orchids with three ice cubes or one quarter cup of water once a week, but may need more hydration if the weather has been too hot in the last week.

How to keep orchids warm?

Orchids prefer warm, dry temperatures during winter months, so keep them warm but not too hot. Find a space in your home where your orchid is not directly above a radiator but still close enough to enjoy residual heat. Avoid drafty areas to maintain temperature.

To increase humidity, create a “humidity tray” by filling a shallow bowl or saucer with pebbles or stones and placing your orchid on top. Fill the tray with water, ensuring it doesn’t reach the bottom of the pot. This method humidifies the air around the plant, mimicking the natural tropical environment.

To ensure orchids receive enough light, place them in the sunniest room with the most windows, avoiding window sills that would expose them to too much direct light. Choose an east-facing window for optimal lighting. Remember to avoid drafty areas and ensure your orchid receives enough light to thrive.

Can orchids live outside in summer?

Orchids, often found in their natural habitat, are sheltered and shaded under trees and forest floors, making them less exposed to direct sunlight. However, they can get sunburn when exposed to intense sunlight in summer or afternoon. This yellowing of leaves, contrasting with the healthy yellow-green foliage of an orchid plant, is a sign of sunburn. Sunburn can be remedied by reducing sunlight exposure or placing the plant in a shadier spot.

However, if left unaddressed, yellow leaves may turn white, sunken, and brown, signaling dryness, decay, and potential death. Sunburned leaves also make the plant susceptible to infections and diseases. Therefore, it is essential to address these issues to ensure the health and longevity of your orchids.

Are orchids sensitive to heat?

The growth and development of orchids can be adversely affected by a number of factors, including direct sunlight, elevated temperatures, excessive watering, and inappropriate placement within the home environment. To guarantee optimal bloom, it is recommended that enthusiasts implement straightforward alterations to their horticultural regimen. Malcolm Gregory suggests that orchids be situated in bright, cool rooms or on windowsills, as they are particularly suited to bathrooms. These straightforward techniques can facilitate the longevity and continued flowering of orchids.