Troubleshooting
Broadway's Melon Cactus problems — and how to fix them
Broadway's Melon Cactus (Melocactus broadwayi) 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.
Cephalium rot
Water or high humidity penetrating the woolly cap causes rot. Always water from the base and maximise air circulation.
Root rot in cool, wet conditions
Temperature below 16°C combined with moist soil is rapidly fatal. Keep at minimum 18°C indoors through winter.
Mealybugs
Infestations in the cephalium wool are common. Remove with isopropyl alcohol on a fine brush; treat heavy infestations with a systemic insecticide.
Delayed cephalium formation
Cephalium develops only when the plant is mature (5-10 years). Sub-optimal light or temperature delays formation. Provide maximum sun and warmth.
Scale insects
Brown scale on the cactus ribs. Scrape off manually and treat with neem oil.
Prevent broadway's melon cactus problems before they start
Most broadway's melon cactus issues are care-mismatch, not bad luck. Dial in the basics:
Broadway's Melon Cactus problems — FAQ
Why is my broadway's melon cactus cephalium rot?
Water or high humidity penetrating the woolly cap causes rot. Always water from the base and maximise air circulation.
Why is my broadway's melon cactus root rot in cool, wet conditions?
Temperature below 16°C combined with moist soil is rapidly fatal. Keep at minimum 18°C indoors through winter.
Why is my broadway's melon cactus mealybugs?
Infestations in the cephalium wool are common. Remove with isopropyl alcohol on a fine brush; treat heavy infestations with a systemic insecticide.
Why is my broadway's melon cactus delayed cephalium formation?
Cephalium develops only when the plant is mature (5-10 years). Sub-optimal light or temperature delays formation. Provide maximum sun and warmth.
Why is my broadway's melon cactus scale insects?
Brown scale on the cactus ribs. Scrape off manually and treat with neem oil.