Troubleshooting
American Dunegrass problems — and how to fix them
American Dunegrass (Leymus mollis) is generally low-drama, but a few issues come up again and again. Here is what each one looks like, why it happens, and the fix.
Aggressive rhizome spread
Dense, wide-spreading rhizomes make this grass difficult to contain in small gardens; use it only in large naturalistic plantings or install a buried root barrier at least 30 cm deep to limit spread.
Rust and fungal leaf diseases
Humid, still conditions can encourage grass rust (Puccinia spp.) and other foliar fungal diseases; improve air circulation and remove badly infected foliage; avoid overhead watering.
Prevent american dunegrass problems before they start
Most american dunegrass issues are care-mismatch, not bad luck. Dial in the basics:
American Dunegrass problems — FAQ
Why is my american dunegrass aggressive rhizome spread?
Dense, wide-spreading rhizomes make this grass difficult to contain in small gardens; use it only in large naturalistic plantings or install a buried root barrier at least 30 cm deep to limit spread.
Why is my american dunegrass rust and fungal leaf diseases?
Humid, still conditions can encourage grass rust (Puccinia spp.) and other foliar fungal diseases; improve air circulation and remove badly infected foliage; avoid overhead watering.