Troubleshooting
Concrete Leaf problems — and how to fix them
Concrete Leaf (Titanopsis calcarea) 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 from overwatering
The most common killer. Soggy soil, poor drainage or watering during summer/winter dormancy rots the roots. Use a gritty mix, water only when bone dry, and keep it dry in cold or hot spells.
Etiolation in low light
Too little sun makes rosettes stretch, soften and turn plain green, losing the warty stone-like texture. Move to the brightest direct light available or add a grow light.
Mealybugs
White cottony pests hide between leaves and on roots (root mealies look like rice grains). Inspect at repotting; treat with neem oil or 70% isopropyl alcohol on a cotton swab, repeating weekly.
Spider mites and aphids
Fine webbing or stippling signals spider mites in dry stagnant air; aphids cluster on flower buds. Improve airflow and rinse or treat with insecticidal soap or neem.
Shrivelling or collapse
Shrivelled leaves usually mean underwatering during the growing season, while a soft, translucent, mushy base signals overwatering rot. Match watering to its winter-growing rhythm to tell them apart.
Prevent concrete leaf problems before they start
Most concrete leaf issues are care-mismatch, not bad luck. Dial in the basics:
Concrete Leaf problems — FAQ
Why is my concrete leaf root rot from overwatering?
The most common killer. Soggy soil, poor drainage or watering during summer/winter dormancy rots the roots. Use a gritty mix, water only when bone dry, and keep it dry in cold or hot spells.
Why is my concrete leaf etiolation in low light?
Too little sun makes rosettes stretch, soften and turn plain green, losing the warty stone-like texture. Move to the brightest direct light available or add a grow light.
Why is my concrete leaf mealybugs?
White cottony pests hide between leaves and on roots (root mealies look like rice grains). Inspect at repotting; treat with neem oil or 70% isopropyl alcohol on a cotton swab, repeating weekly.
Why is my concrete leaf spider mites and aphids?
Fine webbing or stippling signals spider mites in dry stagnant air; aphids cluster on flower buds. Improve airflow and rinse or treat with insecticidal soap or neem.
Why is my concrete leaf shrivelling or collapse?
Shrivelled leaves usually mean underwatering during the growing season, while a soft, translucent, mushy base signals overwatering rot. Match watering to its winter-growing rhythm to tell them apart.