Troubleshooting Leaf Drop on a ZZ Plant (Zamioculcas zamiifolia)

A ZZ plant (1.5 years) suddenly dropped leaves, yellowed a few, and some stems drooped. Owner asked if repotting was needed.

Repot Only If Necessary

Unnecessary repotting is a top cause of failure. Repot only when rootbound (constant water demand, stalled growth, roots out drainage holes, root ball = mostly roots).

Other Causes to Check

• Hot/cold drafts.
• Over/underwatering (allow top 1–2 inches dry; use distilled water).
• Over‑fertilizing (none in winter; half‑strength frequent in growing season).
• Pests/mites.
• Root rot (dark, mushy roots).
• Normal aging: older lower leaves yellow/drop, replaced in spring.

Soil Refresh for Large Plants

Annually in spring, remove 75% of soil with a large spoon, replace with fresh mix, blending into remaining bottom soil.