Water well when in active growth cycle. Permit the medium to dry slightly between waterings. Mist those in your home to promote healthy growth. Increase watering in warm, sunny weather. Water enough to keep psuedobulbs from shriveling.
Temperature varies widely with type of Dendrobium.
More frequent fertilizing is good under high temperatures. An occasional bloom booster may stimulate flowering. Reduce fertilizer when Dendrobiums are in a resting phase. Potting is an important component of growing Dendrobiums. They do best in smaller pots, prefering to be pot-bound.