The Spray Orchid
Dendrobiums are among the most commonly
encountered orchids in the retail trade. Like most
other cultivated orchids, dendrobiums are
epiphytes, or air plants. They have well-developed
water-storage organs (pseudobulbs), often called
"canes" for their upright, leafy appearance. They
should be potted in porous, free-draining media.
There are many different types of dendrobiums
available to the specialist grower. However,
hybrids involving Den. phalaenopsis are what you
will most often encounter.
LIGHT: Sufficient light is important for healthy
growth and flower production.
PROVIDE Bright light, to 50 percent sun. In the
home, an east, west or lightly shaded south window.
In a greenhouse, about 30 to 50 percent of full
sun. Under lights, four 40 watt fluorescent tubes
and two 40 watt incandescent bulbs directly over
plants. Plants should be naturally erect, without
need of (much) staking, and of medium olive-green
TEMPERATURE: Mature plants need a 15 to 20 F
difference between night and day.
PROVIDE Nights of 60 to 65 F; days of 80 to 90 E
Temperatures up to 95 to 100 F are beneficial if
humidity and air circulation are increased. Low
temperatures (below 50 F) may cause leaf drop.
WATER: Keep evenly moist while in active growth.
Allow to dry between waterings after growth is
mature (indicated by terminal leaf).
HUMIDITY: Dendrobiums need 50 to 60 percent. In
the home, place on trays over moistened pebbles. In
greenhouse, use a humidifier if conditions are too
FERTILIZER: Should be provided on a regular
basis during the active growing period.
PROVIDE The exact fertilizer you use will depend
on the mix in which your plant is growing. A good
general rule is to apply a balanced(10-10-10,
12-12-12, or similar ratio) fertilizer "weakly,
weekly" during the period of active growth. That
is, fertilize every week at one quarter to one half
of the recommended dilution.
POTTING: Should be done every two to three years
before mix loses consistency (breaks down). Pot
firmly in medium, giving aeration and ample
drainage, allowing enough room for two years
growth. Dendrobiums grow best in pots small for the
size of the plant.
All the legal stuff
All materials, graphics and
pictures are © copyright 1998-2011 protected and the
property of the OSA, Inc. For their use you must have
written permission from the OSA, Inc.