in the Oncidi
have resulted in plants that have come a long way from the original
in beauty and ease of culture
These plants start bloom
small with spikes
of fancifully patterned flowers in shades of white,
yellow, red and brown, and as they mature become large, robust plants
with long stems of flowers.
start with healthy roots:
Pot in a
Fir bark mi
tures are best, with 0.5 to 1.0
chunks of bark
, perlite and charcoal
s to break down or when the new
growth will be over the edge of the pot.
Remove old medium
if it is loose,
any rotting roots
or brown bulbs
stic pot that
will allow for 2 to 3 new grow
position in the pot so that the new growths
will grow from the
middle to the edge
Roots should dry out somewhat between watering. When the plant
is actively growing, water when
has just begun t
o dry out
t is still slightly
damp. When the plant is completing its growth
start to let it dry more, to encourage flowers rather than vegetative
growth. When it is dormant, typically in winter, do not water until
is almost completely dry. When
thoroughly, with a volume of water at least equal to that of the pot.
Do not use water softened in salt
consuming water softeners.
ow mineral water is preferred, such as
water or rain water. If hard water is used, water ve
ry heavily to flush minerals.
Fertilize weakly and frequently with a balanced fertilizer. One
eighth to one
quarter strength recommended
for house plants every week in spring and
every two weeks in autumn and winter.
thy leaves produce more and bigger flowers:
light levels are appropr
iate. Leaves should be a light
green, not yellowish
(too much light)
or dark green
They should be firm, not long and floppy (more light needed)
A slight red
an ideal light
level on some plants. A more pronounced red blush will indicate too much light.
f sunshine on a windowsill (
12” under an eight
tube fluorescent fixture
or under an
HID sodium or metal halide l
Plant size usually prevents mature plants growing under fluorescent lights.
should be firm;
, check roots for rot, and repot if necessary. High humidity
enclosing the plant in a plastic bag)
will aid recovery i
f most or all of roots lost, but be careful of rot.
Oncidiums do best with 50
% humidity but
will grow and bloom, although more slowly
Use humidifier to raise humidity
but ensure fresh air and air movement to avoid mold and rot.
C minimum winter nights
°C summer day
C day/night difference to aid
Some varieties prefer slightly different temperatures:
Warmer temperatures: Brassia hybrids, including Miltassia, Beallara and Maclellanara.
Cooler temperatures: Odontoglossum hybrids, including Vuylstekeara and Odontioda.
lly bloom annually
and the flowers individually last for
ee or more
Maintain plant orientation while spike
is growing for best display.
often provide much superior flower size and color as mature plants than as first bloom seedlings
turning yellow, wilting and falling prior to opening is from not enough energy in the plant
to open the flower either because the light is too dim, the plant is too small,
the roots have
. Also due to ethylene gas (given off by ripening frui
t), or large temperature changes