Crosses between various species and genera in the Oncidiinae tribe, have resulted in plants that have come a long way from the original species in beauty and ease of culture. These plants start blooming small with spikes of fancifully patterned flowers in shades of white, yellow, purple, red and brown, and as they mature become large, robust plants with long stems of flowers
How to care for:
Light: High light levels are appropriate. 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). Four hours of sunshine on a windowsill is ideal.
Potting: Pot in a fine medium. Fir bark mixtures are best, with 0.5 to 1.0cm chunks of bark, perlite, and charcoal. We recommend Willgro’s Fine Media mix sold at Art Knapps for $8.99. Remove old medium if it is loose, any rotting roots or brown bulbs; choose a plastic pot that will allow for 2 to 3 new growths and position in the pot so that the new growths will grow from the middle to the edge.
Watering: Roots should dry out somewhat between watering. When the plant is actively growing, water when medium has just begun to dry out but 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.
Fertilize: Fertilize with a balanced orchid fertilizer once a week during the spring and summer. Once every two weeks in the fall and winter.
Humidity: Oncidiums do best with humidity, use humidifier, humidity trays or misting.
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.
Orchid tips provided by Canadian Orchid Congress. For more info check out: www.canadianorchidcongress.ca/
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