ZZ Plant Stalk Turning Yellow at the Base: Real Causes and Fix

Cause #1: Rhizome Rot (Most Serious)

If multiple stalks turn yellow at the base AND the base feels soft when squeezed, you have rhizome rot. Unpot immediately. Cut every soft, blackened section of the underground rhizome with a sterilized knife. Dust cuts with cinnamon. Repot in cactus mix, no water for 14 days.

Cause #2: Natural Aging

One older stalk going yellow while the rest are healthy is natural senescence. Cut it at soil level. The plant produces new stalks from the rhizome every 6–12 weeks under good conditions.

Cause #3: Recent Overwatering

Watered too frequently this month? Skip 3 weeks of watering. ZZ plants store water in the rhizome and can go a month between waterings without harm.

Frequently asked questions

Should I propagate the green stalks if rhizome rot is bad?

Yes — cut healthy green stalks above the rotting section. Each stalk can be rooted in water (3–6 months) or planted in moist soil. The mother rhizome may not survive, but the babies will.

How often should I water a ZZ plant?

Every 3–4 weeks in summer, every 5–6 weeks in winter for U.S. apartments. Always let the soil dry completely first.

Sources and references

• ZZ Plant Care — University of Maryland Extension

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