Light
Oncidium orchids are considered intermediate to high light orchids, requiring some direct sunlight in the mornings or evenings when grown indoors. When grown outside, bright, indirect light may be sufficient. The more light you can give your orchid without damaging it (burning it or bleaching out the leaves) The better it will grow and bloom for you.
There are many different species and hybrids of Oncidiums available in today's market. Some requiring more light than others to bloom. If your plant is healthy and growing well, but not blooming, it probably needs more light.
Water
Oncidiums like to maintain some amount of moisture between watering. How often you water is dependent on how quickly the potting mix dries out. Terracotta or un-glazed clay pots will dry out much faster than plastic or glazed ceramic pots.
When you water, completely drench the roots and allow the pot to drain. Never allow your plant to set in water for more than an hour. If in doubt, don't water! Oncidiums store water in their egg-shaped pseudobulbs for times of drought.
Fertilizers and Supplements
Oncidiums do not require a lot of fertilizer. We recommend a well balanced fertilizer once a month at half or quarter strength the manufacturers recommended concentration.
Potting
Many Oncidium orchids can be grown in long-fibers sphagnum moss or an 'open' bark mix. We use a medium size bark mix with many of our Oncidiums. Our bark mix include hard wood chips, coconut husk chips, and sponge rock. The sponge rock provides open air pockets in the mix and can be substituted with anything from charcoal to Styrofoam peanuts.
Be sure to read our section on 'General Orchid Care' for tips on light, water, fertilizers and potting.
