Field Horsetail Thrives in Drought via Deep Rhizomes
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- Equisetum arvense (field horsetail) carries bristles rich in abrasive silicon with a sandpaper-like texture, earning the historic nickname "scouring rush" from when the plant was used to clean wood and polish metal.
- Equisetum has existed since before the dinosaurs, once growing more than 20 metres tall and likely serving as food for herbivorous dinosaurs, the diary entry notes.
- Horsetail survives drought through an underground rhizome network reaching metres deep that can spread beneath roads or foundations, with the plant also reproducing via spores — making it difficult to eradicate.
- The dense horsetail cover provides habitat for invertebrates including weevils, sawfly larvae, and many spider species, while not damaging trees.
- Kate Blincoe's account appears in the newly released collection "Under the Changing Skies: The Best of the Guardian's Country Diary, 2018-2024," available via the Guardian Bookshop.
Why it matters: For gardeners, land managers, and anyone watching drought-parched landscapes, the horsetail's metres-deep rhizome system explains why this so-called "invasive weed" persists where other plants fail — making it both a nuisance beneath roads and foundations and an unexpectedly valuable refuge for invertebrates in barren conditions.
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