Troubleshooting
Encrusted Saxifrage problems — and how to fix them
Encrusted Saxifrage (Saxifraga paniculata) 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.
Crown rot
The most common problem, caused by water sitting in the rosette centre, especially in winter. Plant at a slight angle in rock crevices to shed rain, or protect pots with a pane of glass in wet winters. Ensure free drainage at all times.
Vine weevil grubs
White grubs feed on roots and cause plants to collapse suddenly. Apply a biological control (nematodes, Steinernema kraussei) in spring and autumn, particularly in container plantings. Check root balls when repotting.
Red spider mite (in alpine houses)
Under glass in warm, dry conditions, spider mites cause silvery stippling on foliage. Improve ventilation, raise humidity slightly, and apply predatory mites (Phytoseiulus persimilis) or insecticidal soap.
Prevent encrusted saxifrage problems before they start
Most encrusted saxifrage issues are care-mismatch, not bad luck. Dial in the basics:
Encrusted Saxifrage problems — FAQ
Why is my encrusted saxifrage crown rot?
The most common problem, caused by water sitting in the rosette centre, especially in winter. Plant at a slight angle in rock crevices to shed rain, or protect pots with a pane of glass in wet winters. Ensure free drainage at all times.
Why is my encrusted saxifrage vine weevil grubs?
White grubs feed on roots and cause plants to collapse suddenly. Apply a biological control (nematodes, Steinernema kraussei) in spring and autumn, particularly in container plantings. Check root balls when repotting.
Why is my encrusted saxifrage red spider mite (in alpine houses)?
Under glass in warm, dry conditions, spider mites cause silvery stippling on foliage. Improve ventilation, raise humidity slightly, and apply predatory mites (Phytoseiulus persimilis) or insecticidal soap.