Troubleshooting
African feather grass problems — and how to fix them
African feather grass (Pennisetum macrourum) 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 spread
Spreads aggressively via rhizomes and prolific self-seeding, forming dense colonies. Federally listed noxious weed in the US; restricted in Alabama, California, Florida, Oregon, and other states. Remove seedheads before they mature to limit spread.
Root rot in wet soils
Sensitive to consistently moist or waterlogged conditions, particularly in winter. Ensure sharp drainage; do not mulch heavily over the crown. Lift and divide if centre of clump becomes congested and dies back.
Winter dieback in cool climates
Only reliably hardy to about -5°C (H3). In USDA zones 7 and below, plants may be killed by hard frost. Mulch the crown heavily in autumn or grow in containers that can be overwintered under glass.
Prevent african feather grass problems before they start
Most african feather grass issues are care-mismatch, not bad luck. Dial in the basics:
Looking for african feather grass in general rather than its problems? Read the full african feather grass care guide — light, water, soil and feeding.
African feather grass problems — FAQ
Why is my african feather grass invasive spread?
Spreads aggressively via rhizomes and prolific self-seeding, forming dense colonies. Federally listed noxious weed in the US; restricted in Alabama, California, Florida, Oregon, and other states. Remove seedheads before they mature to limit spread.
Why is my african feather grass root rot in wet soils?
Sensitive to consistently moist or waterlogged conditions, particularly in winter. Ensure sharp drainage; do not mulch heavily over the crown. Lift and divide if centre of clump becomes congested and dies back.
Why is my african feather grass winter dieback in cool climates?
Only reliably hardy to about -5°C (H3). In USDA zones 7 and below, plants may be killed by hard frost. Mulch the crown heavily in autumn or grow in containers that can be overwintered under glass.