CULTIVATION OF THE ONCIDIUM

CULTIVATION OF THE ONCIDIUM (5)

Monday, 23 November 2015 22:41

Oncidium Intergeneric Hybrids

Written by
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

 

 

Monday, 23 November 2015 13:23

Oncidium Wildcat

Written by

 

Q.

Oncostele Wildcat1
We have 100 orchids of many types and most are doing well. Those that are not, often respond to a change in watering or other cultural adjustment. However, we are having problems with Oncostele Wildcat (formerly Colmanara Wildcat). We grow it in an area with oncidiums, vandas and some cattleyas, but the leaves begin to drop and they look like they are going to die. We grow them in lava rock and water every other day. — Fran Eggars

 

A.

Many sources do list Oncostele Wildcat as easy to grow, probably because they are almost ubiquitous as potted plants, and because for most people in most areas, they are among the easier orchids to grow. Unfortunately, in South Florida, you face some problems with Ons. Wildcat. Not insurmountable, but problems nonetheless. Many times these plants will not be well established when purchased, and will have been shipped to this region from a cooler climate. We are right on the edge of this type’s temperature tolerance, so if the weather is particularly hot when they are purchased, especially if the roots are not established, the plant will suffer. Oncostele Wildcat can be grown in South Florida, but it must be kept in the coolest part of your growing area, with the best air circulation. Phalaenopsis light conditions are recommended. The best solution may be to repot in the winter and early spring, unlike many other orchids, and take advantage of the cooler season to re-establish so that the plants can better take the summer heat. Lava rock may work, but most plants of this grex do better in, and again unlike most other orchids in South Florida, a fir-bark based medium. — Ned Nash

 

http://www.aos.org/Default.aspx?id=696

 

 

Wednesday, 04 February 2015 23:36

Do You Know How To Avoid These 8 Dangers With Oncidiums?

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Oncidium orchids are one of the most diverse and oldest types of orchids in the world. They were once described as difficult and temperamental. Nowadays, they have been cultivated anywhere where the temperature is moderate and cool. They are actually easy to grow (if you know what to do) and produce flowers that are very colorful and fragrant.

Thursday, 29 January 2015 00:37

Dancing Ladies: Oncidiums and Their Relatives

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Dancing Ladies: Oncidiums and Their Relatives

This group of orchids is referred to as “dancing ladies” because the lips of many of them are flared like a flounced dancing gown, and the tops of the flowers, with a little imagination, look like the arms and head of a person.

Oncidiums are a joyful bunch of orchids that frequently display a flurry of flowers in the sunny yellow to orange and brown color range, although there are some in shades of pink, red, and green. They’ve been popular since they were first introduced into England from South America in the late 1700s.

 

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