Troubleshooting
Blue-stemmed Polypody problems — and how to fix them
Blue-stemmed Polypody (Polypodium subpetiolatum) 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 glaucous colour
The characteristic blue-green colouration fades with insufficient light or after older fronds age. Ensure bright indirect light and remove aged fronds at the base to encourage fresh, well-coloured new growth.
Rhizome die-back
Overwatering in dense or poorly draining media causes the rhizome to soften and blacken. Always use a gritty, free-draining mix and allow some drying between waterings.
Fungus gnats
Larvae feed on organic matter in moist potting mix. Allow the top layer to dry more between waterings, apply sticky yellow traps for adults, and use a Bacillus thuringiensis var. israelensis (Bti) drench for larvae.
Prevent blue-stemmed polypody problems before they start
Most blue-stemmed polypody issues are care-mismatch, not bad luck. Dial in the basics:
Looking for blue-stemmed polypody in general rather than its problems? Read the full blue-stemmed polypody care guide — light, water, soil and feeding.
Blue-stemmed Polypody problems — FAQ
Why is my blue-stemmed polypody loss of glaucous colour?
The characteristic blue-green colouration fades with insufficient light or after older fronds age. Ensure bright indirect light and remove aged fronds at the base to encourage fresh, well-coloured new growth.
Why is my blue-stemmed polypody rhizome die-back?
Overwatering in dense or poorly draining media causes the rhizome to soften and blacken. Always use a gritty, free-draining mix and allow some drying between waterings.
Why is my blue-stemmed polypody fungus gnats?
Larvae feed on organic matter in moist potting mix. Allow the top layer to dry more between waterings, apply sticky yellow traps for adults, and use a Bacillus thuringiensis var. israelensis (Bti) drench for larvae.