Aerangis orchids should be watered when the potting mix becomes dry to the touch. Water thoroughly until water drains out of the bottom of the pot and then allow the mix to drain completely. Do not let the plant sit in standing water, as this can cause the roots to rot. During the growing season, water Aerangis orchids more frequently, but reduce watering during the dormant season. Additionally, it is important to use water that is low in salt, chlorine, and fluoride, such as rainwater or distilled water, to avoid burning the roots.