Troubleshooting
Crested Wood Fern problems — and how to fix them
Crested Wood Fern (Dryopteris cristata) 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.
Drying out
The most common killer; as a wetland fern it browns and collapses if the soil dries, so keep it constantly damp to boggy.
Brown, crisp fronds in dry heat
Indoor central heating dehydrates the narrow fronds; raise humidity and keep it cool to maintain healthy foliage.
Crown rot in stagnant warmth
Although it tolerates wet soil, warm stagnant conditions at the crown can rot it; favour cool, well-aerated damp over hot and soggy.
Fungus gnats
Permanently moist, rich mix breeds gnats; top-dress with grit and use sticky traps, accepting that some moisture management is a trade-off for this bog lover.
Prevent crested wood fern problems before they start
Most crested wood fern issues are care-mismatch, not bad luck. Dial in the basics:
Looking for crested wood fern in general rather than its problems? Read the full crested wood fern care guide — light, water, soil and feeding.
Crested Wood Fern problems — FAQ
Why is my crested wood fern drying out?
The most common killer; as a wetland fern it browns and collapses if the soil dries, so keep it constantly damp to boggy.
Why is my crested wood fern brown, crisp fronds in dry heat?
Indoor central heating dehydrates the narrow fronds; raise humidity and keep it cool to maintain healthy foliage.
Why is my crested wood fern crown rot in stagnant warmth?
Although it tolerates wet soil, warm stagnant conditions at the crown can rot it; favour cool, well-aerated damp over hot and soggy.
Why is my crested wood fern fungus gnats?
Permanently moist, rich mix breeds gnats; top-dress with grit and use sticky traps, accepting that some moisture management is a trade-off for this bog lover.