Troubleshooting
Boston Fern problems — and how to fix them
Boston Fern (Nephrolepis exaltata 'Bostoniensis') 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
The most common Boston fern complaint, caused by low humidity, inconsistent watering, fluoride in tap water, or proximity to heat sources. Switch to filtered or rain water, raise humidity above 50%, water consistently, and relocate away from vents and radiators.
Frond drop and shedding
Boston ferns shed fronds readily when stressed by cold draughts, sudden temperature changes, or being moved. Maintain stable temperatures above 13°C, avoid draughty windowsills, and minimise repositioning the plant. Shed fronds will be replaced by new growth from the crown.
Scale insects and mealybugs
Sap-sucking pests can colonise frond bases and stems, causing yellowing and sticky residue (honeydew). Remove manually with a damp cloth or cotton pad dipped in isopropyl alcohol, and treat with insecticidal soap spray. Check new plants at purchase.
Prevent boston fern problems before they start
Most boston fern issues are care-mismatch, not bad luck. Dial in the basics:
- Common boston fern problems — the species this cultivar belongs to
- Common boston fern problems — our other guide for the same plant
- PictureThis alternatives — 7 plant ID apps compared
- Boston Fern watering schedule
- Boston Fern light requirements
- Best soil mix for boston fern
- Boston Fern temperature & humidity
- Full boston fern care guide
Boston Fern problems — FAQ
Why is my boston fern frond tip browning?
The most common Boston fern complaint, caused by low humidity, inconsistent watering, fluoride in tap water, or proximity to heat sources. Switch to filtered or rain water, raise humidity above 50%, water consistently, and relocate away from vents and radiators.
Why is my boston fern frond drop and shedding?
Boston ferns shed fronds readily when stressed by cold draughts, sudden temperature changes, or being moved. Maintain stable temperatures above 13°C, avoid draughty windowsills, and minimise repositioning the plant. Shed fronds will be replaced by new growth from the crown.
Why is my boston fern scale insects and mealybugs?
Sap-sucking pests can colonise frond bases and stems, causing yellowing and sticky residue (honeydew). Remove manually with a damp cloth or cotton pad dipped in isopropyl alcohol, and treat with insecticidal soap spray. Check new plants at purchase.