A few months back, we talked about orchid leaves turning purple which can commonly occur during the winter. Now that we are in the final weeks of summer with plenty of heat still lingering, let’s talk about yellow leaves.
There are a number of reasons why orchid leaves turn yellow, some of which should cause concern while others are just part of your plant’s natural life cycle.
If you have recently repotted an otherwise healthy plant, yellowing leaves may be a sign of stress. It is completely natural for a repotted orchid to shed leaves. The first stage of this shedding process will be the yellowing of select leaves. There is nothing to worry about if the rest of the plant looks strong.
Too Much Sun
If you grow your orchid outside, summer is the time when you need to take extra care to ensure that your plants aren’t getting burned. If the pseudobulbs and roots of your plant look healthy, but the you notice yellowing leaves, it’s likely that your orchids are simply getting too much sun. “Sunburn” will start on the highest point of the leaf. Leaves will turn from a nice healthy looking green to a lime-ish green then to yellow. If nothing is done to protect your plant, you will eventually find unsightly, round, papery spots that will permanently scar your plant.
Too Little Water or Too Much Water
If your leaves are beginning to turn yellow and are also floppy, wrinkled and/or leathery it is likely that your plant needs more water. Water your plant thoroughly and allow the water to completely drain.
On the flipside, overwatering can cause your plant to yellow. If your leaves look droopy, sickly and even slimy, you may be watering too much. Overwatering can kill a plant literally from the roots up. The roots of an overwatered plant will turn black and begin to rot before your leaves alert you that there is a problem. If you think you have overwatered your orchid, place your plant in a well ventilated location to allow more air flow to stave off bacterial or fungal infections. Wait until the potting media has dried out, then begin watering your plant again with less frequency than before.
Natural Life Cycle
If the lowest leaves of your otherwise healthy looking Phalaenopsis plant begin to yellow, don’t worry and do nothing. Your orchid is just going through a normal growth cycle to shed older leaves. We recommend that you avoid the temptation to cut the yellow leaf. Doing so could introduce fungus through the open cut wound. Your plant will seal the cut area if you allow the leaf to naturally die and fall off.
Bacteria, Fungus and Viruses
Yellow leaves can often be a sign of a bacterial, fungal or viral infection. Check the underside of your leaves as well as your roots for signs of infection and treat with a Bactercide, Fungicide, or Virucide. Use as directed by the manufacturer.
The key to happy, healthy orchids is to listen to your plants. We hope next time you spot a yellow leaf, you will have a better idea of what your orchid is trying to tell you.
Happy Blooming from Better-Gro!