Troubleshooting
Deceptive Mammillaria problems — and how to fix them
Deceptive Mammillaria (Mammillaria decipiens) 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.
Root rot
Overwatering is the primary killer. Ensure the soil dries completely between waterings and use a well-draining mix.
Mealybugs
White woolly deposits in the axils of tubercles are a sign of mealybug infestation. Treat with isopropyl alcohol on a cotton swab.
Scarring or corky patches
Old damage, sunscald, or pest feeding leaves permanent corky marks. Prevent by avoiding sudden moves from low to high light.
No blooms
A cool, dry winter dormancy is needed to trigger spring flowering. Reduce watering and keep temperatures around 10-12°C from October to February.
Spider mites
Fine webbing and stippled appearance indicate spider mites, usually occurring in hot, dry conditions. Increase air circulation and apply an appropriate miticide.
Prevent deceptive mammillaria problems before they start
Most deceptive mammillaria issues are care-mismatch, not bad luck. Dial in the basics:
Deceptive Mammillaria problems — FAQ
Why is my deceptive mammillaria root rot?
Overwatering is the primary killer. Ensure the soil dries completely between waterings and use a well-draining mix.
Why is my deceptive mammillaria mealybugs?
White woolly deposits in the axils of tubercles are a sign of mealybug infestation. Treat with isopropyl alcohol on a cotton swab.
Why is my deceptive mammillaria scarring or corky patches?
Old damage, sunscald, or pest feeding leaves permanent corky marks. Prevent by avoiding sudden moves from low to high light.
Why is my deceptive mammillaria no blooms?
A cool, dry winter dormancy is needed to trigger spring flowering. Reduce watering and keep temperatures around 10-12°C from October to February.
Why is my deceptive mammillaria spider mites?
Fine webbing and stippled appearance indicate spider mites, usually occurring in hot, dry conditions. Increase air circulation and apply an appropriate miticide.