Troubleshooting
Metallic Blue Fern problems — and how to fix them
Metallic Blue Fern (Microsorum thailandicum) 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.
Loss of blue iridescence
Too much light fades the metallic colour to green. Move to a shadier position to restore the signature blue sheen.
Browning frond edges
Caused by low humidity or hard, mineral-rich water. Keep humidity above 70 percent and use soft or rainwater.
Rhizome or root rot
Comes from a soggy, dense medium. Use an airy, fast-draining epiphytic mix and let the surface dry slightly between waterings.
Very slow or stalled growth
Usually cold temperatures or low humidity. Keep warm above 20°C in a humid enclosure to encourage steady new fronds.
Prevent metallic blue fern problems before they start
Most metallic blue fern issues are care-mismatch, not bad luck. Dial in the basics:
Looking for metallic blue fern in general rather than its problems? Read the full metallic blue fern care guide — light, water, soil and feeding.
Metallic Blue Fern problems — FAQ
Why is my metallic blue fern loss of blue iridescence?
Too much light fades the metallic colour to green. Move to a shadier position to restore the signature blue sheen.
Why is my metallic blue fern browning frond edges?
Caused by low humidity or hard, mineral-rich water. Keep humidity above 70 percent and use soft or rainwater.
Why is my metallic blue fern rhizome or root rot?
Comes from a soggy, dense medium. Use an airy, fast-draining epiphytic mix and let the surface dry slightly between waterings.
Why is my metallic blue fern very slow or stalled growth?
Usually cold temperatures or low humidity. Keep warm above 20°C in a humid enclosure to encourage steady new fronds.