Worldwide Orchids :
Oncidiums' water needs vary depending on the temperature, light and humidity levels, and potting media.
Healthy, well-rooted plants should be allowed to dry between waterings. Others should be watered again when the media is still lightly moist.
A good way to judge when it is time to rewater is when the top one to two inches of potting mix feel dry to the touch. Another test is to note the weight of the plant after watering and again before rewatering. The plant and pot will weigh less as the media dries out.
Run water through from the top, allowing enough to flow so as to flush out undissolved minerals from the potting mix. Water should form a pool at the top of the plant. Let the plant drip dry through drain holes in the bottom of the pot. Then, place on a saucer if needed.
Remember to thoroughly wet the media when watering-you cannot hurt the plant by allowing too much water to enter and drain through the potting mix.
Your plant should be fertilized every other week.
Be aware that overwatering is the most commonreason orchid plants are lost. To avoid overwatering, remember to allow time for the top layer of media to dry between waterings.
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