Oncidium Orchids
Masses of branches carrying small, dancing, yellow flowers with big lips are classic Oncidium highlights, although there are so many types that reds and browns, splashes and spots are also often seen. There are two main types, hot-growing “equitants” with little fans of leaves, and “mule-ears” that are much bigger and often enjoy cooler conditions.
Light - Best in high light in a southern window or outdoors in summer; bloom best when leaves are tinged red at edges.
Temperature - Day – normal room temperature to hot, 70sº -90º F; Night – about 55º F will suit both types.
Watering - Drench thoroughly when the potting mix feels dry one half inch down, or daily for those mounted on bark or tree fern slabs. Oncidiums prefer high humidity and moving air.
Feeding - Give a light application of soluble orchid fertilizer once a week when actively growing.
Potting Mix - Medium orchid mix in clay pots, or mounted on slabs
Tips for Rebloom - Many prefer not to be repotted and like growing into large specimens.
Don't forget: Oncidiums must be well-drained, so don't let them stand in water!
Written by Graham Rice