Troubleshooting
Avalanche Reed Grass problems — and how to fix them
Avalanche Reed Grass (Calamagrostis acutiflora 'Avalanche') 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.
Leaf scorch on white stripes
White portions of the leaf are more susceptible to sun scorch and drought damage. Ensure adequate moisture and consider light afternoon shade in hot climates.
Rust fungus
Orange pustules in summer humidity. Remove affected leaves and avoid wetting foliage when watering. Rarely requires fungicide.
Loss of variegation (reversion)
Occasional all-green shoots should be removed at the base immediately to prevent them dominating the plant.
Crown rot in wet winters
Improve soil drainage and cut back old foliage in late winter. In heavy clay, plant on a slight mound to aid drainage.
Clump decline after 4-5 years
Divide in early spring to rejuvenate. Discard the older central portion and replant vigorous outer sections.
Prevent avalanche reed grass problems before they start
Most avalanche reed grass issues are care-mismatch, not bad luck. Dial in the basics:
Avalanche Reed Grass problems — FAQ
Why is my avalanche reed grass leaf scorch on white stripes?
White portions of the leaf are more susceptible to sun scorch and drought damage. Ensure adequate moisture and consider light afternoon shade in hot climates.
Why is my avalanche reed grass rust fungus?
Orange pustules in summer humidity. Remove affected leaves and avoid wetting foliage when watering. Rarely requires fungicide.
Why is my avalanche reed grass loss of variegation (reversion)?
Occasional all-green shoots should be removed at the base immediately to prevent them dominating the plant.
Why is my avalanche reed grass crown rot in wet winters?
Improve soil drainage and cut back old foliage in late winter. In heavy clay, plant on a slight mound to aid drainage.
Why is my avalanche reed grass clump decline after 4-5 years?
Divide in early spring to rejuvenate. Discard the older central portion and replant vigorous outer sections.