Guy Edwardes / 2020VISION / Giant horsetail (Equisetum telmateia), Catcott Lows SWT reserve, Somerset Levels, England, UK, April. 2020VISION Book Plate. Did you know? Horsetails can grow to over two metres tall.

Wild Wonders of Europe / Wothe / Great horsetail (Equisetum telmateia) close-up of stem, Poloniny National Park, Western Carpathians, Eastern Slovakia, Europe, June 2009 WWE BOOK. WWE INDOOR EXHIBITION

Nick Upton / Dense stand of Great horsetail (Equisteum telmateia) spore cones emerging from canal bank, Bathampton, Bath and northeast Somerset, UK, March.

Nick Upton / Stand of Great horsetail (Equisteum telmateia) spore cones emerging from canal bank, Bathampton, Bath and northeast Somerset, UK, March.

Nick Upton / Stand of Great horsetail (Equisteum telmateia) spore cones emerging from canal bank, Bathampton, Bath and northeast Somerset, UK, March.

MYN / Dirk Funhoff / Great horsetail (Equisetum telmateia), Büchelberg, Pfalz, Germany. September. Meetyourneighbours.net project

MYN / Dirk Funhoff / Great horsetail (Equisetum telmateia), Büchelberg, Pfalz, Germany. September. Meetyourneighbours.net project

Colin Varndell / Stem of Great horsetail (Equisetum telmateia) in spring. Dorset, UK April.

Chris Mattison / Great horsetail (Equisetum telmateia) fertile frond, Derbyshire, UK. April.

Nick Upton / Low angle view of Great horsetail (Equisteum telmateia) sterile stems emerging from marshy ground fringing a pond, Wiltshire, UK, May.

Nick Upton / Low angle view of Great horsetail (Equisteum telmateia) spore cones emerging from marshy ground fringing a pond, Wiltshire, UK, April.

Nick Upton / Spore cones of Great horsetail (Equisteum telmateia) amerging from marshy ground around a pond, Wiltshire, UK, April.