root rot on Zz Plant
Quick answer
If your Zz Plant has root rot, the most likely cause is: Overwatering and poor drainage in moisture-retentive soil (like loam or peat). ZZ plant rhizomes store water efficiently; prolonged wet conditions lead to anaerobic bacterial/fungal decay, characterized by black, mushy rhizomes and white mycelial growth.
Start here:
- 1. Unpot and inspect: Trim all black, mushy, or foul-smelling roots and rhizome sections with sterilized shears.
- 2. Disinfect: Dip remaining healthy roots/rhizomes in a 1:2 hydrogen peroxide to water solution for 10 minutes.
Why Zz Plant gets root rot
Zamioculcas zamiifolia
Overwatering and poor drainage in moisture-retentive soil (like loam or peat). ZZ plant rhizomes store water efficiently; prolonged wet conditions lead to anaerobic bacterial/fungal decay, characterized by black, mushy rhizomes and white mycelial growth.
Other documented causes on zz plant:
- • Hollow, papery roots in ZZ plants are caused by extreme under-watering (desiccation) rather than fungal decay. This often occurs when soil becomes hydrophobic, repelling water and leaving rhizomes unable to rehydrate even during watering events.
- • ZZ plant stalks are highly susceptible to rot when propagated in water without a proper callousing period. The succulent stems enter a dormancy-like state in excess moisture and fail to root, leading to anaerobic bacterial softening at the base.
How to reverse root rot on Zz Plant
- 1
Unpot and inspect: Trim all black, mushy, or foul-smelling roots and rhizome sections with sterilized shears.
- 2
Disinfect: Dip remaining healthy roots/rhizomes in a 1:2 hydrogen peroxide to water solution for 10 minutes.
- 3
Seal cuts: Apply cinnamon or super glue to excised rhizome areas to prevent reinfection.
- 4
Repot: Use a gritty, well-draining mix (50% perlite or pumice) in a pot with drainage holes.
- 5
Withhold water: Do not water for 2 weeks to allow healing.
Keep root rot off this Zz Plant
Allow soil to dry 100% through the entire pot before watering. Use terracotta pots and avoid "careful" frequent small sips of water.
Other Zz Plant problems
Same Problem on Other Plants
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