Plant Problem Diagnostic
Horsetail (Mare's Tail): Realistic Control
The short answer
Horsetail (Equisetum arvense), often called mare's tail, is one of the most persistent perennial weeds because its rhizomes (underground stems) can reach up to 2m deep, far below where you can dig. Be realistic: there is no quick fix, and control needs patience and persistence over several years rather than a single treatment.
The most reliable non-chemical approach is repeated removal to exhaust the roots: pull or cut off all the green shoots as they appear, starting in around June with a second session in late summer, and keep it up year after year. Regular mowing controls it in lawns, laying turf and mowing can clear an area over a few years, and root-barrier membranes can restrict spread. Persistence, not a single method, is what wins.
Why horsetail is so hard to beat
Horsetail spreads by deep, wide-ranging rhizomes that can grow to about 2m deep. Because you cannot realistically dig out roots that deep, the plant regrows from what remains, which is why gardeners find it comes back season after season. Setting expectations matters: you are aiming to weaken and exhaust it over years, not eliminate it in one go.
- Rhizomes reach up to 2m deep, below the reach of digging
- Regrows readily, so expect a multi-year effort
- Rhizomes near the surface can be forked out, but deeper roots need heavy excavation
Patient, repeated control
- 1Remove shoots repeatedly — Hand-pull or cut all green stems as soon as they appear; the RHS suggests pulling in June with a second weeding in late summer to catch regrowth.
- 2Keep at it for years — Removing shoots as soon as they show, sustained over a number of years, gradually reduces the infestation.
- 3Mow in lawns — Where horsetail comes up in a lawn, regular mowing keeps it in check; laying turf over an infested area and mowing can clear it within a few years.
- 4Use root barriers — Specialist root-barrier fabric, with overlapping sealed joints protruding at least 7.5cm above soil level, can restrict spread into clean ground.
A realistic outlook
Because the roots run so deep, even weedkillers containing glyphosate applied in late summer usually need several applications over a number of years, and results are not guaranteed. The honest picture is that horsetail is managed rather than eradicated, and consistent, repeated removal is what steadily starves it. For other tough perennials that spread underground, see our guide on controlling deep-rooted perennial weeds without chemicals.
⚠ Do not expect a single treatment to clear horsetail. Anyone promising a quick, permanent fix is overselling it; steady, repeated removal over years is the honest answer.
Sources
Reviewed 2026-07-18. We cite university Extension, government, and established horticultural sources — and never invent pesticide rates or dangerous treatments.
- RHS — Horsetail — Rhizomes can grow to 2m deep; control is difficult and needs patience and persistence; hand-pull green stems in June with a second weeding in late summer; repeated shoot removal over several years reduces infestation; regular mowing keeps it in check in lawns; turf and mowing can eradicate over a few years; root-barrier fabric protruding at least 7.5cm above soil restricts spread; glyphosate needs several applications over years.