Most of the remaining varieties require intermediate temperatures of 60-75 degrees. Humidity is very important to orchid plants. A gravel tray containing water can be placed under the plants to increase humidity levels around the plants. Make sure the bottoms of the pots are above the level of the water. Daily misting is also helpful.
Orchids generally prefer to dry out well between waterings.
If the roots are kept wet for more than a few days they may rot. Seedlings or plants with fleshy roots or soft foliage usually prefer constant moisture. They usually receive a good rain once a day and then they dry out. To simulate this in the home or greenhouse we use potting media such as fir bark, osmunda fiber, tree fern fiber, or special orchid potting mixes that allow good air circulation in the root area. These potting media can be obtained from an orchid supplier.