Troubleshooting
Blue Lyme Grass problems — and how to fix them
Blue Lyme Grass (Leymus arenarius 'Blue Dune') 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.
Invasive spreading
Rhizomes travel aggressively and can overrun beds and lawns; plant in buried containers or with root barriers to keep it confined.
Colour fade in shade
Blue foliage greens and growth loosens in too much shade; full sun keeps it compact and brightly coloured.
Flopping flower stems
Tall flowering stems can lean or splay, especially in rich soil; lean conditions and full sun improve posture, or shear flowers off.
Tired centre
Old colonies can become bare and ratty in the middle; cut back hard in late winter and divide or thin to refresh.
Prevent blue lyme grass problems before they start
Most blue lyme grass issues are care-mismatch, not bad luck. Dial in the basics:
Looking for blue lyme grass in general rather than its problems? Read the full blue lyme grass care guide — light, water, soil and feeding.
Blue Lyme Grass problems — FAQ
Why is my blue lyme grass invasive spreading?
Rhizomes travel aggressively and can overrun beds and lawns; plant in buried containers or with root barriers to keep it confined.
Why is my blue lyme grass colour fade in shade?
Blue foliage greens and growth loosens in too much shade; full sun keeps it compact and brightly coloured.
Why is my blue lyme grass flopping flower stems?
Tall flowering stems can lean or splay, especially in rich soil; lean conditions and full sun improve posture, or shear flowers off.
Why is my blue lyme grass tired centre?
Old colonies can become bare and ratty in the middle; cut back hard in late winter and divide or thin to refresh.