Yellow leaves on ZZ plant: causes and fixes

Zamioculcas zamiifolia

Quick answer

Yellow leaves on your ZZ plant have a few possible causes, and on this plant the likeliest is overwatering and rot at the base.

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Toxic to pets

Most likely cause

Overwatering & rot at the base

How to tell

The soil stays wet for days, and the rot starts low: a soft, discolored patch at the base rather than one particular old leaf. Small dark flies around moist potting medium may be fungus gnats. They suggest conditions suitable for breeding, without proving that the surface never dries.

The fix

Stop watering completely. Wait until the soil has dried out completely before you even think about the next one, and check the pot actually drains. If only some roots are brown and mushy, trim them and repot in fresh, fast-draining mix. If the base itself is soft, the damage is more serious and recovery is uncertain. Only propagate using a method suited to this plant, not arbitrary pieces above the rot.

Other possible causes

Not a match? Compare the signs below to find the one you have.

Too little light

How to tell

The yellowing comes with pale, stretched new growth leaning toward the nearest window. That combination shows that the spot is too dim for a ZZ plant.

The fix

Move it to a brighter spot, but keep it out of harsh midday sun, which scorches.

Thirst (underwatering)

How to tell

The soil is bone dry, and the yellowing arrives alongside wrinkled stalks rather than soft, mushy growth.

The fix

Feel the soil before every watering rather than watering on a fixed day. If it is dry, water thoroughly and let the excess drain. If it is still damp, wait and check again later.

Hungry (but rarely the real culprit)

How to tell

ZZ plant grows slowly and needs very little feeding, so a uniform pale-yellow fade after many months without any is possible, but check watering and light first: those are far more common on this plant.

The fix

Use a balanced liquid fertilizer at half the strength on the label, about every 120 days while it’s actively growing. Overfeeding a slow grower like this does more harm than skipping it.

Simple old age

How to tell

An older, lower leaf slowly yellows or shrivels on its own while new growth looks plump and healthy. That’s normal turnover on a ZZ plant, not a symptom.

The fix

Nothing is wrong. Remove the spent leaf once it comes away easily and carry on.

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Last reviewed: 2026-10-16