Troubleshooting
Broom Palm problems — and how to fix them
Broom Palm (Thrinax morrisii) 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.
Lethal yellowing disease
A phytoplasma disease spread by leafhopper insects; symptoms include yellowing and drop of older fronds progressing upward. No cure once advanced; preventive antibiotic injections (oxytetracycline) can slow progression.
Ganoderma butt rot
Fungal rot at the trunk base causing internal decay; no treatment available — affected palms must be removed to prevent spread.
Nutrient deficiency
Manganese deficiency ('frizzle top') causes new fronds to emerge stunted and withered; correct with soil-applied manganese sulfate.
Scale insects
Treat with horticultural oil spray; ensure thorough coverage of frond undersides and the trunk crannies.
Transplant shock
Moves poorly; minimise root disturbance and keep well-watered for 6-12 months after planting.
Prevent broom palm problems before they start
Most broom palm issues are care-mismatch, not bad luck. Dial in the basics:
Broom Palm problems — FAQ
Why is my broom palm lethal yellowing disease?
A phytoplasma disease spread by leafhopper insects; symptoms include yellowing and drop of older fronds progressing upward. No cure once advanced; preventive antibiotic injections (oxytetracycline) can slow progression.
Why is my broom palm ganoderma butt rot?
Fungal rot at the trunk base causing internal decay; no treatment available — affected palms must be removed to prevent spread.
Why is my broom palm nutrient deficiency?
Manganese deficiency ('frizzle top') causes new fronds to emerge stunted and withered; correct with soil-applied manganese sulfate.
Why is my broom palm scale insects?
Treat with horticultural oil spray; ensure thorough coverage of frond undersides and the trunk crannies.
Why is my broom palm transplant shock?
Moves poorly; minimise root disturbance and keep well-watered for 6-12 months after planting.