To care for Phalaenopsis orchids with yellowing leaves, provide the plants with adequate light and water. Since some yellowing is natural and inevitable, determine the source of the problem before altering your care of your plant.
- Check the leaves
Older leaves at the bottom of the orchid naturally age and yellow over time until they drop off the plant. If only the bottom leaves are yellow, your plant is healthy, so you do not need change the way you are caring for your plant. If the top leaves are yellowing, the orchid may be receiving too much water or light.
- Provide appropriate light
If the leaves at the top of the plant are yellow, firm and plump, the orchid is most likely receiving too much light. In the summer, keep orchid plants in a shadier spot, out of direct sunlight. In the winter, remember to put the plant back into the best light possible.
- Adjust the amount of water
If the leaves are yellow, dry and wilted, the Phalaenopsis orchid is not receiving enough water. During the growing season, water the plant regularly to prevent roots from drying out. In the summer, lightly mist the orchid with water. While watering, avoid wetting the foliage, and do not leave the plant sitting in water.