Troubleshooting
Pony Tails Grass problems — and how to fix them
Pony Tails Grass (Stipa tenuissima) 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 self-seeding
Seeds prolifically and can naturalise aggressively in mild regions (a noxious weed in parts of Australia/California). Shear off seed heads before they ripen to limit spread.
Dead-looking centre
Clumps often die out in the middle after a few years. Lift, divide and replant the healthy outer sections, or treat as a short-lived plant and renew from seed.
Crown rot on wet soil
Winter wet is the main killer. Plant in sharp drainage and avoid heavy clay or low spots that hold water.
Untidy by late winter
Old foliage browns and mats. Comb out dead blades with gloved fingers in early spring; avoid cutting it hard, which it dislikes.
Prevent pony tails grass problems before they start
Most pony tails grass issues are care-mismatch, not bad luck. Dial in the basics:
Looking for pony tails grass in general rather than its problems? Read the full pony tails grass care guide — light, water, soil and feeding.
Pony Tails Grass problems — FAQ
Why is my pony tails grass invasive self-seeding?
Seeds prolifically and can naturalise aggressively in mild regions (a noxious weed in parts of Australia/California). Shear off seed heads before they ripen to limit spread.
Why is my pony tails grass dead-looking centre?
Clumps often die out in the middle after a few years. Lift, divide and replant the healthy outer sections, or treat as a short-lived plant and renew from seed.
Why is my pony tails grass crown rot on wet soil?
Winter wet is the main killer. Plant in sharp drainage and avoid heavy clay or low spots that hold water.
Why is my pony tails grass untidy by late winter?
Old foliage browns and mats. Comb out dead blades with gloved fingers in early spring; avoid cutting it hard, which it dislikes.