Cymbidium omeiense - The Omei-Shan Cymbidium is found growing in Emei Shan in Sichuan province of China...
Cymbidium omeiense also called as The Omei-Shan Cymbidium, Cymbidium faberi var. omeiense, is a species of the genus Cymbidium. This species was described by Ying Siang Wu and Sing Chi Chen in 1966.
IDENTIFY CYMBIDIUM OMEIENSE - THE OMEI-SHAN CYMBIDIUM
Cymbidium omeiense is native to China South-Central, China Southeast,
Vietnam. It is found growing in Emei Shan in Sichuan province of China. On
further study, this taxon might well prove to be of hybrid origin, probably
with Cymbidium tortisepalum being one of its parents.
It is a large sized, warm to cool growing terrestrial with indistinc pseudobulbs. The leaves are 4 or 5, lorate, 15-30 × 0.6-1 cm, subleathery, without transparent veins, not articulate toward base, margin slightly serrulate, apex acuminate.
The Omei-Shan Cymbidium blooms in spring from the subbasal, slightly arching or curved, 15-17 cm long inflorescence with laxly 3- or 4-flowered rachis and linear-lanceolate, 15-25 × 2-4 mm floral bracts. The flowers are fragrant, appearing twice per year, 5 cm in diameter; sepals and petals are pale yellow-green, sepals with a purplish red midvein in basal half, petals with purplish red spots; lip is pale yellow-green with a central narrowly cordate purplish red patch; column yellowish with purplish red stripes on ventral surface.
CYMBIDIUM OMEIENSE - THE OMEI-SHAN CYMBIDIUM CARE AND CULTURE
Cultural information should only be used as a guide, and should be to be adapted to suit you. Your physical location; where you grow your plants, how much time you have to devote to their care, and many other factors, will need to be taken into account. Only then can you decide on the cultural methods that best suit you and your plants.
Light:
Cymbidium omeiense needs the light level of 27000 - 43000 lux during the early growth, this may require 50% shading especially in summer months. Regular growth light level should be at 43000 - 54000 lux (30% shading during summer). At flowering light levels should be at 20000 - 30000 lux. In cool areas or in winter months, full sun is tolerated.
Watch the color of the leaves; foliage should be yellowish-green in color, but too much light will result in a pale yellow color and if burned, a black spot at the arch of the leaf. If severely burned, the leaf will be bleached white. If too shady, plants will be dark, lush green but will bloom less or not at all.
Temperature:
The Omei-Shan Cymbidium needs day temperatures of 18-24°C and night temperatures of 7-13°C. It is very important for initiation of spikes to have a difference in temperatures between night and day. This can be achieved in the summer by sprinkling the leaves in the late afternoon or early evening for evaporative cooling.
The plant will tolerate a few degrees of frost, but temperatures of -3°C and below cause damage to the inflorescences. In parts of the country where the weather in winter is extreme, grow the plants outside during spring and summer, and then move them indoors as late as possible at the first threat of frost.
Humidity:
Cymbidium omeiense needs the humidity levels of 40 - 60% most of the time, however they can tolerate humidity levels of 60 - 80% in times of high light which will help to also reduce temperature levels. Humidity should also be reduced to 40 - 60% at flowering.
Good air circulation is essential for good plant growth, supplying oxygen and carbon dioxide and promoting the quick drying off of leaves thus preventing fungal, bacterial and red spider problems. The air surrounding the plant must be moist. Bad ventilation causes poor growth and immature buds to yellow and drop off.
Substrate, growing media and repotting:
The Omei-Shan Cymbidium are usually grown in pots or containers with excellent drainage, filled with loose, quickly drying substrate, so that the plants can be watered frequently and the substrate is kept dry. Most growers use a mixture based on tree fern bark or chopped fibers. Different amounts of chopped sphagnum moss, osmunda fern roots, sand, perlite, charcoal and fibrous clay are also usually added; many growers use fine to medium bark without additives. Medium granulation bark in the lower half of the pot and in the upper part, fine bark with the addition of about 10% perlite and 10% charcoal works perfectly well.
The plant should be repotted only if the pot is overcrowded which happens on average every two or three years or when the medium has broken down, for the plant thrive best when left undisturbed. Repotting should be carried out during spring (after flowering). During repotting dead or withered roots should be removed. Older roots should be trimmed up to 10-15 cm from the base of the bulbs; Leave the root tissue to air dry. Always sterilize cutting tools between plants.
If you decide to divide the plant, look for natural divisions which allow three to five-bulb groupings. If the dormant bulbs (back bulbs) can be removed without destroying the strength of the division, remove them. These can be potted up to resprout and bloom in two to four years.
Watering:
Cymbidium omeiense should be watered abundantly during active growth, but there should be excellent drainage and the substrate around the roots should never be soggy or stale. Water more frequently in periods of dry heat and winds and less in cold, wet weather. When the new growths reach maturity in autumn, the amount of water should be gradually reduced.
The plant love overhead watering during summer and early autumn, but never in the middle of the day on hot days or the leaves will burn and you may cause rot. It is best to overhead water late in the afternoon or early evening when the sun has gone from the plants. Such watering washes dust and dirt from the leaves and allows the plant to take in moisture through the leaves. Do not overhead water or mist in cold or wet winter weather. Water early in the morning in winter so plants can dry out. In winter it is better to under rather than over water.
Fertilizer:
When the plants are actively growing, from September through to mid December, they must have an NPK fertiliser high in nitrogen to stimulate growth. From mid December, when flower spikes initiate, flowering should be encouraged by the use of a fertiliser high in phosphorous and potash. These assist in the formation of flower spikes, ensuring that the flowers will be bigger and stronger and firm up the leaves thus avoiding soft growth. Fortnightly fertilizing using half recommended strength is advisable. You may prefer to fertilize at quarter strength every week. It is important to always give the plants a good watering before fertilizing, otherwise the roots will burn.
To avoid mineral deposits building up during periods of heavy fertilization, it is advisable to rinse the containers approximately every month. Rinsing is especially important where the water is highly mineralized. First, water the plant normally to dissolve the accumulated salts, and after about an hour, rinse the substrate with water equal to twice the volume of the container.
Rest period:
The Omei-Shan Cymbidium should be limited in the amount of water during 2-3 winter months. They should dry up a bit between waterings, but they must not be left without water for too long. Fertilization should be reduced or eliminated until new growths appear in spring, at which point regular watering resumes.
With high temperature and illumination, the plant may not enter dormancy and produce many new growths on immature forming growth. This would be considered to be a major problem and the whole production can be set back by as much as 2 years.
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