Watering frequency depends on the medium in which they are potted. Most orchids cannot survive prolonged drought and should be watered often. Nutrients must be provided in dilute concentrations when orchids are grown on inert media. Moderate air circulation is required for best growth. Be aware that many factors may prevent flowering in orchids.
Insufficient light is the most common reason.
If there is too little light, the leaves become a deep, lush green. With too much light the leaves turn yellow-green. For proper flowering, the leaves should have only a slight yellow tint. Some orchids may not bloom if the nighttime and daytime temperatures are the same. Consistently warm temperatures are good for vegetative growth, but may suppress flower development.