Humidity is the percentage of water vapor in the air, with lowest during the day and highest in the evening, night, and morning. Orchids require humidity to grow well, as it helps them breathe and reduces transpiration (water loss). To increase humidity, use water trays under pots and pour a small layer of gravel, marbles, or leca.
A humidifier is one of the most effective ways to increase humidity for orchids. Most orchid types grow best with humidity between 40 and 70, which is a good benchmark for growing almost any orchid as a houseplant. There are several options to keep an orchid surrounded by the right amount of humidity, but the best way is with a humidity tray.
If indoor air is too dry and plants are struggling, there are measures you can take to meet their humidity needs. These include using stones and gravel humidity trays, rock and charcoal humidity trays, pebble humidity trays, glass saucer humidity trays, and cork tripod humidity drip trays.
To increase humidity in indoor growing areas, use humidifiers, humidity trays, and grouping plants closer together. An egg-crate louver setup is a simple way to increase humidity, and misting is another way to increase humidity. To promote higher humidity during winter months, try turning down the thermostat a few degrees, especially at night, for both you and your plants.
Unless you have extremely dry conditions or sensitive orchids, you don’t need a humidifier; just water them when they’re dry. Virtually all orchids do best when humidity ranges from 40 to 70, as raising humidity lowers the rate of transpiration (water loss) from the plant.
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