Troubleshooting
Yellow Whitlow Grass problems — and how to fix them
Yellow Whitlow Grass (Draba aizoides) 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 (Pythium / Fusarium)
The most common problem; caused by water sitting in the rosette or waterlogged soil in winter. Plant in vertical crevices or raise on gravel to improve drainage and air circulation around the crown.
Aphids
Colonies of greenfly can infest stems and buds in spring; treat with a dilute insecticidal soap spray, directing it away from the tight rosette to avoid moisture buildup.
Slugs and snails
Particularly damaging to young rosettes in mild, damp springs; a top-dressing of coarse grit around the cushion acts as a physical deterrent.
Prevent yellow whitlow grass problems before they start
Most yellow whitlow grass issues are care-mismatch, not bad luck. Dial in the basics:
Yellow Whitlow Grass problems — FAQ
Why is my yellow whitlow grass crown rot (pythium / fusarium)?
The most common problem; caused by water sitting in the rosette or waterlogged soil in winter. Plant in vertical crevices or raise on gravel to improve drainage and air circulation around the crown.
Why is my yellow whitlow grass aphids?
Colonies of greenfly can infest stems and buds in spring; treat with a dilute insecticidal soap spray, directing it away from the tight rosette to avoid moisture buildup.
Why is my yellow whitlow grass slugs and snails?
Particularly damaging to young rosettes in mild, damp springs; a top-dressing of coarse grit around the cushion acts as a physical deterrent.