oncidium

The Oncidium (on-SID-ee-um), also called dancing lady, is a large and diverse species. The Psychopsis orchid (a member of the Oncidium family) has the distinction of reputedly inciting Orchideliurm, the orchid craze that swept across Europe during the Victorian era

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TEMPERATURE

Most Oncidiums prefer intermediate (58° to 62° F/14.4°-17° C) to warm (70-80° F/21°-26.7° C) temperatures, with cooler temperatures at night, and warmer temperatures during the day.

LIGHT

Oncidiums need bright light (2000-4000 fc) and can be grown in a bright east, south or west-facing window. These orchids also do well grown under lights.

HUMIDITY

Humidity levels between 40-60% are ideal for this orchid. Use a humidifier if necessary and a fan set to low to provide air movement. Home growers: remember 50% is the maximum recommendation. Easily track humidity levels with a humidistat.

WATER

Allow the pot to dry between watering. Water more frequently during the summer and less often during the winter months. Use the lead (newest) pseudobulb as a guide. This bulb should be plump, firm, and smooth. As these leaves spot easily, avoid getting the leaves wet.

FERTILIZATION

Use a high nitrogen liquid fertilizer (9-3-6) every other week if your orchid is potted in bark. Those potted in other media should use a balanced fertilizer. The exception is equitant Oncidiums. These twig epiphytes will burn if given high nitrogen fertilizer.

POTTING & MEDIA

Pot after new pseudobulbs has begun growing. Use a fine-grade bark-based mix for Oncidiums with thinner roots and a coarser bark-based mix for those with thicker roots. Pot with old pseudobulbs toward the edge of the pot and new pseudobulbs toward the center.

TIPS

Some Oncidiums have a delightful fragrance. Like chocolate? Try ‘Sharry Baby.’ Or, maybe vanilla? Try ‘Twinkle.’

fragrant windowsill orchid

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