Troubleshooting
Rough Tree Fern problems — and how to fix them
Rough Tree Fern (Cyathea cooperi) 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.
Frond tip browning
Most commonly caused by low humidity or insufficient watering of the trunk. Increase ambient humidity and ensure the trunk is kept moist in addition to watering the soil.
Frost damage
Tender to frost — even light frost damages fronds and hard frost kills the growing tip. Protect with fleece or bring container specimens indoors before temperatures drop below 2°C.
Scale insects
May colonise frond bases and trunk scales. Remove with a soft brush and apply neem oil spray, repeating every 2 weeks until clear.
Stunted fronds in containers
Large tree ferns become pot-bound relatively quickly. Re-pot into the largest feasible container in spring, or plant out in mild sheltered gardens.
Prevent rough tree fern problems before they start
Most rough tree fern issues are care-mismatch, not bad luck. Dial in the basics:
Rough Tree Fern problems — FAQ
Why is my rough tree fern frond tip browning?
Most commonly caused by low humidity or insufficient watering of the trunk. Increase ambient humidity and ensure the trunk is kept moist in addition to watering the soil.
Why is my rough tree fern frost damage?
Tender to frost — even light frost damages fronds and hard frost kills the growing tip. Protect with fleece or bring container specimens indoors before temperatures drop below 2°C.
Why is my rough tree fern scale insects?
May colonise frond bases and trunk scales. Remove with a soft brush and apply neem oil spray, repeating every 2 weeks until clear.
Why is my rough tree fern stunted fronds in containers?
Large tree ferns become pot-bound relatively quickly. Re-pot into the largest feasible container in spring, or plant out in mild sheltered gardens.