Troubleshooting
Rotstrahlbusch Switch Grass problems — and how to fix them
Rotstrahlbusch Switch Grass (Panicum virgatum 'Rotstrahlbusch') 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.
Flopping in summer
Caused by shade or rich soil. Site in full sun and lean ground; ring-stake or cut back hard in late winter to keep the clump upright.
Weak red colour
Too little sun or excess nitrogen mutes the burgundy tones. Move to a brighter spot and stop feeding to restore the deep summer-red foliage.
Rust and leaf spot
Orange or brown blade spotting appears in humid, crowded conditions. Improve air flow, avoid overhead watering and divide congested clumps.
Dead centre / hollow clump
Mature clumps die out in the middle after several years. Lift and divide in spring to rejuvenate vigour.
Prevent rotstrahlbusch switch grass problems before they start
Most rotstrahlbusch switch grass issues are care-mismatch, not bad luck. Dial in the basics:
Looking for rotstrahlbusch switch grass in general rather than its problems? Read the full rotstrahlbusch switch grass care guide — light, water, soil and feeding.
Rotstrahlbusch Switch Grass problems — FAQ
Why is my rotstrahlbusch switch grass flopping in summer?
Caused by shade or rich soil. Site in full sun and lean ground; ring-stake or cut back hard in late winter to keep the clump upright.
Why is my rotstrahlbusch switch grass weak red colour?
Too little sun or excess nitrogen mutes the burgundy tones. Move to a brighter spot and stop feeding to restore the deep summer-red foliage.
Why is my rotstrahlbusch switch grass rust and leaf spot?
Orange or brown blade spotting appears in humid, crowded conditions. Improve air flow, avoid overhead watering and divide congested clumps.
Why is my rotstrahlbusch switch grass dead centre / hollow clump?
Mature clumps die out in the middle after several years. Lift and divide in spring to rejuvenate vigour.