There can be several reasons why the leaves of your precious orchid plants are turning yellow. One thing is for sure, though, it’s not happy and it’s calling out for your help.
Find out what yellowing leaves in orchids mean and what to do about it.
Overexposure to direct light
One of the top reasons why leaves of orchid plants, specifically phalaenopsis orchids, turn yellow is sunburn. If you believe this is the case, move your orchid in a well-lit but roofed area if you’re keeping it outdoor.
However, if it’s currently on your windowsill or anywhere near it, we recommend fitting your windows with a sheer curtain. This way, your orchid can still bask in the morning sunshine but won’t get scorched by intense afternoon heat, especially during summer.
Remember that most orchids thrive in bright, indirect light. A proven indicator that an orchid plant is getting adequate light is that its leaves are a radiant, grassy kind of green. On the contrary, a dark green leaf means it’s kept somewhere without sufficient access to light. While most orchid plants can survive low-light conditions, the chances of it reblooming are quite unlikely.
Stress due to low temperature
A sudden or extreme drop in temperature can also be causing its leaves to turn yellow. Optimal temperatures for orchid plants should be anywhere between 65 and 80 Fahrenheit during the day and 60 and 70 Fahrenheit in the evening.
Lack of feeding/fertilization
Orchids need to be fed, particularly during their growing or blooming season. Yellow orchid leaves could be an indication that it has some sort of nutrient deficiency. Experts recommend following a weekly, weakly schedule when it comes to feeding. By reducing the strength of your orchid fertilizer, you are lowering your risks of burning its roots or stressing the plant. Make sure you use a well-balanced orchid fertilizer free of urea, so it will have a good range of nitrogen availability, which is beneficial to your orchid. Do your feeding after watering your orchid plant good and proper.
An overwatered orchid, or any plant for that matter, looks limp, lifeless, leaves can be yellow, and soil is soaking wet. Orchids love moisture but they don’t want to be stuck in soggy soil that will quickly rot their roots and make them vulnerable to plant diseases.
Salvaging an overwatered orchid plant is possible but challenging. It’s easy for things to go downhill when this happens.
The best route to take is to prevent this painful scenario from happening. Water only when the topsoil is dry to the touch. Follow a regular watering schedule. Believe it or not, your orchids have higher chances of surviving when they’re underwatered than when they’re overwatered -- which is the number one culprit behind houseplant casualties, by the way.
Signs of aging
Lastly, you should also check if the yellowing leaves are from the bottom part of the plant or just occasional ones. This could just be a part of the normal aging process of your orchid plant. In this case, those yellow leaves will soon fade, fall, and will be replaced by new, healthy foliage.
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