Troubleshooting
Mexican Feather Grass problems — and how to fix them
Mexican Feather Grass (Nassella tenuissima) 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.
Aggressive self-seeding / invasiveness
Seeds prolifically and is invasive or restricted in parts of California, Australia and elsewhere. Cut off flower heads before seed sets and check local guidance before planting.
Rot in wet or rich soil
Heavy, damp or fertile soil rots the crown and shortens its life. Plant in sharp-draining, lean ground and avoid overwatering.
Tired, thatchy clumps
Dead blades accumulate within the mound. Comb out or rake the clump in spring (gloves help) rather than cutting it to the ground.
Barbed seed awns
The clinging awns stick to clothing and pet fur and can work into skin. Handle and deadhead with care, especially around pets.
Prevent mexican feather grass problems before they start
Most mexican feather grass issues are care-mismatch, not bad luck. Dial in the basics:
Looking for mexican feather grass in general rather than its problems? Read the full mexican feather grass care guide — light, water, soil and feeding.
Mexican Feather Grass problems — FAQ
Why is my mexican feather grass aggressive self-seeding / invasiveness?
Seeds prolifically and is invasive or restricted in parts of California, Australia and elsewhere. Cut off flower heads before seed sets and check local guidance before planting.
Why is my mexican feather grass rot in wet or rich soil?
Heavy, damp or fertile soil rots the crown and shortens its life. Plant in sharp-draining, lean ground and avoid overwatering.
Why is my mexican feather grass tired, thatchy clumps?
Dead blades accumulate within the mound. Comb out or rake the clump in spring (gloves help) rather than cutting it to the ground.
Why is my mexican feather grass barbed seed awns?
The clinging awns stick to clothing and pet fur and can work into skin. Handle and deadhead with care, especially around pets.