LIGHT: Dendrobiums require a good deal of light. If placed under one layer of house screening during the winter (as on a patio), they can remain there all year if shielded from hot western sun during the summer. Good air circulation is important; grow with the Cattleyas.
TEMPERATURE: Normal temperatures (55-60° ) all year round, though they can manage nicely in winter with a minimum of 50° , and can go up to 85° during the summer if humidity is maintained and air circulation is good. 50 to 60% humidity is ideal. Indoors in winter it may be necessary to mist regularly or to place the plant on a tray filled with pebbles with a water level up to the top of the pebbles. Do not allow to stand in water.
WATER: Dendrobiums prefer small pots and like to be somewhat potbound. Therefore, do not overpot. Water twice each week and allow water to run through completely. A prolonged rest and dry period after flowering is not necessary to these plants.
FEEDING: Apply a balanced fertilizer once each 2 weeks if the medium is gravel, tree fern or osmunda; Peters 20-20-20 is suitable. If the medium is fir bark, use a high nitrogen fertilizer such as Peters 30-10-10. Use either of these fertilizers every 2 weeks at full strength, or as an alternative, try them once each week at ½ strength. Be especially careful to fertilizer adequately during active growth.