Yellow leaves on a Pothos: 5 causes and the right fix

A yellowing pothos leaf is almost never a death sentence, but it is never an insignificant event either. Five main causes explain this symptom in pothos, and each calls for a different response. The good news: the pothos is so tolerant that the fix almost always works quickly, provided you identify the right cause.

First, observe the pattern

Before changing anything, look closely at the yellow leaf. Four clues point to the cause:

With these four observations, you have 80 percent of the diagnosis.

Cause 1, overwatering (most common)

The pothos hates wet feet. If several leaves at the base of the plant yellow at once, the stem bases feel soft, and the substrate stays wet more than a week after watering, it is almost certain: you are watering too much.

Excess water drowns the roots, which can no longer breathe. Deprived of oxygen, they rot quickly, and the plant can no longer absorb nutrients properly. Result: your pothos is starving in saturated substrate.

The fix is simple. Take the plant out of the pot, examine the roots. Healthy roots are white or cream, firm. Rotten roots are brown, soft, sometimes smelly. Cut all rotten parts with a disinfected shear. Repot in fresh well-draining substrate: 50 percent potting soil, 25 percent perlite, 25 percent pine bark. Do not water until the top 2-3 cm are dry.

For follow-up, see our complete guide on watering pothos which details the finger method.

Cause 2, natural aging

If only one leaf at the base of the plant yellows slowly, and everything else grows normally, it is the natural cycle. The pothos renews its leaves every 18 to 24 months, sacrificing the oldest to feed the new ones. Nothing to do except cut the leaf at its base once it is more yellow than green.

Cause 3, nutrient deficiency

Yellowing between the veins, with veins staying green, is the signature of chlorosis, often due to iron, magnesium, or nitrogen deficiency. It happens mainly:

To plants not repotted in over 2 years. Substrate is exhausted of nutrients. To plants never fertilized. To plants watered exclusively with softened water that removes minerals.

The fix is progressive. Apply a liquid green plant fertilizer diluted by half, every 2 weeks for a month. If the problem persists, repotting with fresh substrate in spring resets everything.

Cause 4, hard tap water

Limescale and chlorine build up in the substrate over time. Signature: leaf tip and edge brown, the rest turns yellow. Progressive, you notice it after several months.

Three habits correct this. Let water stand 24 hours before watering: chlorine evaporates. Alternate with rainwater or filtered water every other watering. Every six months, flush the substrate generously with warm water to evacuate accumulated salts.

Cause 5, direct sun

The pothos prefers indirect light. Direct sun behind glass, especially in summer or early morning on an east exposure, yellows then browns exposed leaves. The discolored zone is always on the window side.

Move the plant 1 to 2 meters away, or install a sheer curtain to diffuse the light. Already yellowed leaves will not recover, but new ones will come out well colored.

Conversely, in low light, the pothos mainly loses the yellow variegation of Golden or Marble Queen cultivars but does not usually yellow. See our article on pothos in low light.

When in doubt, the photo settles it

Several causes can look alike. Yellowing with brown tips can be from limescale or too much direct sun. A yellow leaf with soft base can be overwatering or a past cold shock. The Spriggo app identifies the predominant cause from a simple photo, and saves you from changing several parameters at once, which makes diagnosis even more confused.

See also our complete pothos sheet for care basics.