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Light: Light requirements vary from bright light to full sun depending on species. Most oncidiums need bright light to partial full sun. A good rule of thumb to follow is the thicker the leaf, the more sun required by the plant. Most oncidiums prefer and east or west window without shade to restrict the light in the home. Outside most oncidiums like morning sun.
Temperature: Most oncidiums are intermediate to warm growing, ranging from 80-95 with a 15 temperature drop at night going into the cooler season to promote flowering. Warmer temperatures are tolerated with increased humidity and air movement.
Water: Water requirements vary by species as well. Plants with large fleshy leaves and large psuedobulbs require less water because the store more water in these organs. Plants with thin leaves and thin roots should never completely dry out. Many oncidiums require less water during the cooler months when they are not actively growing.
Humidity: Oncidiums do no require as much humidity as most orchids. 30% humidity is adequate for them to flourish. In the home a humidity tray is sufficient for increasing humidity levels. Outside or in a greenhouse you do not need to increase humidity levels unless you live in a dry environment.
Fertilizer: Oncidiums prefer a well balanced fertilizer during the growing season, such as 20-20-20. Use a bloom formula such as 6-30-30 going into the cooler months to help initiate flowering. Fertilizer should be applied at ½ strength with every watering. Leaching with clear water should be once a month.
Potting: Oncidiums should be repotted every 1-2 years. A medium grade bark such as the Off mix should be used. Sphagnum moss can be added to fine rooted and thin leaved plants for water retention. Plants should be positioned in the pot allowing new growth room for the next season to grow.
Copyright © 2008 Orchid Doctor - All rights reserved.
Devon, PA 19333
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