Britannica
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How tall do most living horsetails grow?
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Equisetopsida
Giant horsetail of Europe (Equisetum telmateia).
Most living species of horsetails (Equisetum) are less than one metre (three feet) tall. While some specific varieties, such as the giant horsetail (E. praealtum), can reach heights of 3.5 metres (11.5 feet), and the South American species E. giganteum may grow up to 10 metres (about 32 feet) in height, these are exceptions to the general size of the genus.12