Temperature requirements vary widely depending on the specific group. Generally, they can tolerate daytime temperatures of 65° to 95° and night temperatures of 45° to 60°F. Most dendrobiums do well under intermediate to warm conditions. Many plants require cooler nights while resting. Better growth will result if correct temperatures for specific groups are adhered to.
High light is important, especially when orchid is growing. Light from a screened-in patio is ideal. About 25% to 50% full sun will work. This will ensure strong, healthy, and numerous blooms. When the orchids are cooler or in their resting phase, less light is needed. Consult your orchid book for specific light requirements for certain types of dendrobiums.
When plants are growing, water just when they become dry. Some types need a severe drying while resting . Water plants in the morning and mist if the humidity is low. Ideal humidity is around 40% to 60%.
Potting media provides little nourishment for these heavy feeders, so a regular fertilizing schedule is important. When the plant is actively growing, give them a well-balanced liquid fertilizer such as a 20-20-20 formulation. Apply a bloom booster to stimulate and enhance flowering. The higher the light and temperature, the more you should fertilize. In the summer, plants can be fed once every 2 weeks. In the winter or during their resting phase, very little fertilizer, if any at all, is required.
This large, diverse group of orchids requires different potting techniques to match the natural habitat of the orchid. Some dendrobiums like to be potted using a cattleya mix in a pot. Many of the 'phalaenopsis types' or evergreen dendrobiums like to be potted. Others do better if mounted on a tree fern plaque or a bark slab. Many of your deciduous, pendulous types do better if mounted this way. Some do better if mounted in a basket. Each group of dendrobium does best if mounted or potted according to their particular needs. Look up your specific type to select the best mounting for your orchid.