Troubleshooting
The King Ostrich Fern problems — and how to fix them
The King Ostrich Fern (Matteuccia struthiopteris 'The King') 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.
Summer frond browning and collapse
The most common problem, caused by drought or excessive sun. Matteuccia naturally goes partially dormant in hot, dry conditions. Maintain consistent moisture, apply a thick mulch, and position in afternoon shade. Fronds will not recover once browned but new growth returns the following spring.
Invasive spreading
'The King' spreads vigorously via stolons and can colonise large areas rapidly. Install root barriers or grow in large containers sunk into the ground to limit spread. Dig out unwanted stolons and young crowns in autumn.
Slug damage to emerging croziers
Young, emerging fiddleheads in spring are highly attractive to slugs and snails. Protect with ferric phosphate slug pellets or copper tape around bed edges. Hand-picking at dusk is effective in small gardens. Damage at this stage ruins both the ornamental and edible crop.
Prevent the king ostrich fern problems before they start
Most the king ostrich fern issues are care-mismatch, not bad luck. Dial in the basics:
The King Ostrich Fern problems — FAQ
Why is my the king ostrich fern summer frond browning and collapse?
The most common problem, caused by drought or excessive sun. Matteuccia naturally goes partially dormant in hot, dry conditions. Maintain consistent moisture, apply a thick mulch, and position in afternoon shade. Fronds will not recover once browned but new growth returns the following spring.
Why is my the king ostrich fern invasive spreading?
'The King' spreads vigorously via stolons and can colonise large areas rapidly. Install root barriers or grow in large containers sunk into the ground to limit spread. Dig out unwanted stolons and young crowns in autumn.
Why is my the king ostrich fern slug damage to emerging croziers?
Young, emerging fiddleheads in spring are highly attractive to slugs and snails. Protect with ferric phosphate slug pellets or copper tape around bed edges. Hand-picking at dusk is effective in small gardens. Damage at this stage ruins both the ornamental and edible crop.