Quick facts quoted from the RHS web page
Common name Horsetail, mare’s tail
Botanical name Equisetum arvense
Areas affected Beds, borders, lawns, paths and patios
Main causes May establish from seed, but usually arrives via rhizomes from neighbouring gardens, or stem fragments in composts or manures
Timing Seen in spring and summer; treat in late summer.
Regular hoeing will keep some form of control. The weed should not be composted as the seeds will live in the compost heap ready to grow again.
There are various chemical cures suggested:
Bayer Tough Rootkill comes ready to use in 800 ml containers at £3.62 ex vat with offers of a discount for wholesale. However the Bayer website only mentions difficult weeds like docks, nettles and other such common problems
Bayer Garden Super Strength Glyphosate (18 Sachets) can be bought from Amazon and is on offer at £19.64 (fiver saving at the moment). There’s a claim for this that says “Ideal for all tough weed killing; including Japanese Knotweed, ivy and brambles”
Doff Knockdown Maxi Strength Weedkiller which claims to treat 416 square metres at £10.80 – or a case of six for £73.56.
- Kurtail which is £25.98 +VAT for half a litre but claims to kill the weed
There is no easy or cheap cure and every claimed cure may need to be repeated where horsetail is coming either from seed or from adjacent properties.