Pothos leaves, like any other plant, can turn yellow due to several factors: excessive watering, deficiency, inadequate sunshine, temperature differences, or even a draft. The symptoms are easily identifiable: parts of the leaves are affected by yellow spots that spread quickly and more or less uniformly, then fall off, and growth is slowed down.
Causes of yellow leaves on Pothos
Chlorosis (Iron deficiency)
It may be a deficiency problem; a deficiency frequently causes yellowing of the foliage. This is especially true for potted plants, which are more exposed to soil exhaustion. It could be an iron deficiency: this is called Chlorosis. The yellowing, induced by the disappearance of chlorophyll, begins at the edge of the leaves and extends towards the veins, which remain green. All plant species can be affected.
In the case of Iron chlorosis, linked to a too calcareous soil, we will take care to lower the pH of the soil by a good amendment and the use of Chelated Iron fertilizers.
Excessive or inadequate fertilizer also can make the leaves of Pothos turn yellow. A monthly diet with a portion of water-soluble indoor plant food is sufficient.
Bad watering (Moisture stress)
It can also be a bad watering; overwatering is a common cause of yellowing, especially for potted plants. An excessively soggy potting soil induces asphyxiation of the roots, which is irreparable since the plant can no longer feed properly, its leaves turn yellow, then it dies. Always wait for the substrate to dry on the surface before watering. Do not leave standing water in the saucers; most plants do not like to have their feet in the water!
A lack of water can also cause yellowing of the leaves, usually accompanied by rapid wilting: the effects of water stress are generally quite dramatic and are difficult to confuse with signs of deficiency.
Most plants do not like drafts or high thermal amplitudes, so make sure your potted Pothos are not subject to it. Sunshine is also important; a partial shade plant exposed to direct sun may show signs of yellowing. Conversely, plants that love the sun will not enjoy a shaded exposure. Do not worry too much if only a few leaves are yellow, especially if they are old leaves; even for evergreens, the leaves are constantly renewing, so it is normal for the older ones to turn yellow.
One of the main causes of yellow leaves on Pothos is the long exposure to direct sunlight. Pothos plants like moderate amounts of light and can even thrive in low light. On the other hand, it will not tolerate direct sunlight. The yellow color in Pothos leaves can be an indication that your plant is getting too much sun.
If you had this Pothos in a south-facing window, move it to another location, or further from the light. Otherwise, solve the problem of yellow leaves on pothos by hanging a transparent curtain between the plant and the window.