Orchids need to have their roots constantly moist, but you have to be very careful not to create standing water. Irrigation is done by spraying water on the substrate (for plants on the ground) or by immersing them in water for about 2 minutes and no more. Allow the plant to drain well to avoid stagnation.
The best way to determine when your orchid needs water is to put your finger in the substrate to see if it’s wet or not. Another way is to make sure that the roots are apple green. If they are not greyish, they need water.
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