Troubleshooting
Narrow-leaf Zamia problems — and how to fix them
Narrow-leaf Zamia (Zamia angustifolia) is generally forgiving once you match its basics, but a few issues come up again and again. Here is what each one looks like, why it happens, and the fix.
Manganese deficiency
Shows as yellowing of new fronds (interveinal chlorosis) while older leaves remain green. Common in alkaline soils or after frequent flushing. Apply a foliar manganese sulfate spray or switch to a cycad-specific fertiliser that includes chelated micronutrients.
Cycad scale (Aulacaspis yasumatsui)
A white armoured scale specific to cycads that can kill plants if untreated. Look for white crust on stems, caudex, and leaf undersides. Treat repeatedly with horticultural oil; severe infestations may require systemic imidacloprid soil drench.
Cold damage
Fronds discolour and collapse below 10°C. While the caudex may survive brief cold spells, prolonged cold causes lasting damage. Move container plants indoors before temperatures drop, and avoid frost exposure entirely.
Prevent narrow-leaf zamia problems before they start
Most narrow-leaf zamia issues are care-mismatch, not bad luck. Dial in the basics:
Looking for narrow-leaf zamia in general rather than its problems? Read the full narrow-leaf zamia care guide — light, water, soil and feeding.
Narrow-leaf Zamia problems — FAQ
Why is my narrow-leaf zamia manganese deficiency?
Shows as yellowing of new fronds (interveinal chlorosis) while older leaves remain green. Common in alkaline soils or after frequent flushing. Apply a foliar manganese sulfate spray or switch to a cycad-specific fertiliser that includes chelated micronutrients.
Why is my narrow-leaf zamia cycad scale (aulacaspis yasumatsui)?
A white armoured scale specific to cycads that can kill plants if untreated. Look for white crust on stems, caudex, and leaf undersides. Treat repeatedly with horticultural oil; severe infestations may require systemic imidacloprid soil drench.
Why is my narrow-leaf zamia cold damage?
Fronds discolour and collapse below 10°C. While the caudex may survive brief cold spells, prolonged cold causes lasting damage. Move container plants indoors before temperatures drop, and avoid frost exposure entirely.