root rot on Mammillaria
Quick answer
If your Mammillaria has root rot, the most likely cause is: Several small-growing Mammillaria species are described as particularly rot-prone if kept too wet in cool weather, since their tuberous roots and dense, clustering habit sit in damp soil during winter dormancy and rot spreads quickly up the stem once it starts.
Start here:
- 1. Keep Mammillaria guelzowiana and similar clustering species in a shallow pot to prevent root rot, particularly with larger clusters, and reduce watering during cool winter weather.
- 2. Allow the soil to become almost dry between waterings; more succulents die from overwatering than from anything else, and a dry rest is essential to keep roots healthy.
Why Mammillaria gets root rot
Mammillaria
Several small-growing Mammillaria species are described as particularly rot-prone if kept too wet in cool weather, since their tuberous roots and dense, clustering habit sit in damp soil during winter dormancy and rot spreads quickly up the stem once it starts.
How to reverse root rot on Mammillaria
- 1
Keep Mammillaria guelzowiana and similar clustering species in a shallow pot to prevent root rot, particularly with larger clusters, and reduce watering during cool winter weather.
- 2
Allow the soil to become almost dry between waterings; more succulents die from overwatering than from anything else, and a dry rest is essential to keep roots healthy.
- 3
If rot is visible, take a clean, rot-free cutting from the tip with a sterilized tool, allow the wound to heal, and reroot it in fresh, porous cactus compost.
Keep root rot off this Mammillaria
Use a good, porous cactus compost and water only when the soil is nearly dry; provide a dry, cool winter rest without overwatering and avoid deep containers that hold moisture around Mammillaria roots.