Monday, 23 November 2015 22:41

Oncidium Intergeneric Hybrids

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P
ronounced: on
-
SID
-
ee
-
um
Crosses between various species and genera
in the Oncidi
in
ae tribe,
have resulted in plants that have come a long way from the original
species in beauty and ease of culture
.
These plants start bloom
ing
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.
Healthy
Oncidiums
start with healthy roots:
Pot in a
fine
Fir bark mi
x
tures are best, with 0.5 to 1.0
cm
chunks of bark
, perlite and charcoal
.
Report when the medium
start
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
;
c
hoose a
pla
stic pot that
will allow for 2 to 3 new grow
t
hs and
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
medium
has just begun t
o dry out
bu
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
medium
is almost completely dry. When
watering, water
thoroughly, with a volume of water at least equal to that of the pot.
Do not use water softened in salt
-
consuming water softeners.
L
ow mineral water is preferred, such as
naturally
soft
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
by
manufacturer
for house plants every week in spring and
summer and
every two weeks in autumn and winter.
Heal
thy leaves produce more and bigger flowers:
High
light levels are appropr
iate. Leaves should be a light
green, not yellowish
(too much light)
or dark green
(too
little light)
.
They should be firm, not long and floppy (more light needed)
.
A slight red
blush indicates
an ideal light
level on some plants. A more pronounced red blush will indicate too much light.
Four
hours o
f sunshine on a windowsill (
West
or South
)
or 6
-
12” under an eight
tube fluorescent fixture
or under an
HID sodium or metal halide l
amp
.
Plant size usually prevents mature plants growing under fluorescent lights.
should be firm;
if wrinkled
, check roots for rot, and repot if necessary. High humidity
(such as
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
-
60
% humidity but
when mature
will grow and bloom, although more slowly
,
i
n lower
humidity.
Use humidifier to raise humidity
humidity pans
and misting
minimally
effective. Enc
losing
plant growing
areas
is effective
but ensure fresh air and air movement to avoid mold and rot.
Grow
Oncidium hybrids
in intermediate
temperatures
with 14
°
C minimum winter nights
and 29
°C summer day
maximum
.
Ensure 6
-
12
°
C day/night difference to aid
flower formation.
Some varieties prefer slightly different temperatures:
o
Warmer temperatures: Brassia hybrids, including Miltassia, Beallara and Maclellanara.
o
Cooler temperatures: Odontoglossum hybrids, including Vuylstekeara and Odontioda.
Oncidiums
usua
lly bloom annually
and the flowers individually last for
th
r
ee or more
weeks
:
Maintain plant orientation while spike is growing for best display.
Oncidiums
often provide much superior flower size and color as mature plants than as first bloom seedlings.
Buds 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,
or
the roots have
rotted
. Also due to ethylene gas (given off by ripening frui
t), or large temperature changes

 

http://www.canadianorchidcongress.ca/cculture/oncidium.pdf

 

 

Read 1132 times Last modified on Monday, 23 November 2015 23:10
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