My Oncidium intergeneric hybrid orchid has black spots on its leaves. What should I do?
If the water is too cold when you water the plant and it gets on the foliage, some Oncidium intergeneric hybrids will produce tiny black spots on their leaves which look like freckles. It is simply cosmetic damage and you don't need to worry.
To reduce the likelihood of more spots developing, water carefully. Place the plant in a sink and allow the water to soak through and drain out completely. Always water in the morning. Use tepid water, as it will reduce spotting, help to dissolve fertilizer salts and not shock the plants. Dab away any water sprayed on the leaves immediately.
These orchids like to approach dryness before they receive more water. Oncidium intergenerics generally needs to be watered when the potting medium has dried out slightly, never allowed to dry out completely. Day length, humidity and individual heat systems will affect the rate at which water evaporates from the growing medium, but the Oncidium intergeneric hybrids do not have a rest period requiring a significant reduction in watering. Use your finger to test an inch or so down for dryness before you water.
For additional information on caring for your Oncidium hybrid, please see our guide Oncidium Intergeneric Hybrid Orchid Culture.
Courtesy of NYBG Plant Information Service
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