Troubleshooting
Cushion Sandwort problems — and how to fix them
Cushion Sandwort (Arenaria tetraquetra) 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.
Cushion rot
Moisture trapped in the tight cushion in winter or humid summers causes interior rot. Improve drainage drastically, consider alpine house protection in winter, and ensure excellent air circulation.
Invasion by moss and liverwort
In moist conditions, mosses can colonise and smother the slow-growing cushion. Remove by hand carefully; improve drainage and sunlight to discourage competition.
Failure to flower
Insufficient winter cold prevents the cold vernalisation needed for blooming. Plants grown in mild climates or indoors may not flower. Ensure exposure to natural winter temperatures.
Prevent cushion sandwort problems before they start
Most cushion sandwort issues are care-mismatch, not bad luck. Dial in the basics:
Cushion Sandwort problems — FAQ
Why is my cushion sandwort cushion rot?
Moisture trapped in the tight cushion in winter or humid summers causes interior rot. Improve drainage drastically, consider alpine house protection in winter, and ensure excellent air circulation.
Why is my cushion sandwort invasion by moss and liverwort?
In moist conditions, mosses can colonise and smother the slow-growing cushion. Remove by hand carefully; improve drainage and sunlight to discourage competition.
Why is my cushion sandwort failure to flower?
Insufficient winter cold prevents the cold vernalisation needed for blooming. Plants grown in mild climates or indoors may not flower. Ensure exposure to natural winter temperatures.