Troubleshooting
Perez de la Rosa's Mammillaria problems — and how to fix them
Perez de la Rosa's Mammillaria (Mammillaria perezdelarosae) 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 or a poorly draining mix will cause basal rot quickly. Water sparingly and ensure excellent drainage at all times.
Mealybugs
White cottony deposits in the axils indicate mealybugs. Treat with isopropyl alcohol applied carefully with a cotton swab.
Slow or no growth
This species is naturally slow-growing. Ensure maximum sunlight, appropriate watering, and correct feeding during the growing season.
Failure to flower
Requires a cool, dry winter rest of 8-10 weeks at around 10°C to set flower buds. Minimum watering during this period is key.
Sunscald
When moving from indoors to a brighter outdoor location in summer, acclimatise the plant slowly over 1-2 weeks to prevent bleaching.
Prevent perez de la rosa's mammillaria problems before they start
Most perez de la rosa's mammillaria issues are care-mismatch, not bad luck. Dial in the basics:
Perez de la Rosa's Mammillaria problems — FAQ
Why is my perez de la rosa's mammillaria root rot?
Overwatering or a poorly draining mix will cause basal rot quickly. Water sparingly and ensure excellent drainage at all times.
Why is my perez de la rosa's mammillaria mealybugs?
White cottony deposits in the axils indicate mealybugs. Treat with isopropyl alcohol applied carefully with a cotton swab.
Why is my perez de la rosa's mammillaria slow or no growth?
This species is naturally slow-growing. Ensure maximum sunlight, appropriate watering, and correct feeding during the growing season.
Why is my perez de la rosa's mammillaria failure to flower?
Requires a cool, dry winter rest of 8-10 weeks at around 10°C to set flower buds. Minimum watering during this period is key.
Why is my perez de la rosa's mammillaria sunscald?
When moving from indoors to a brighter outdoor location in summer, acclimatise the plant slowly over 1-2 weeks to prevent bleaching.