Equisetum English: Horsetail Spanish: Cola de caballo Estonian: Osi This plant measures between 1 and 3 meters in height with a thickness of about 3 cm. The growth of the plant is manifested with that of its stems. It has curative properties. It is necessary to be careful not to take other varieties because they can be toxic, as happens with Equisetum with a higher palustrina content. Leaves Stem The sterile stems are 10–90 cm tall and 3–5 mm diameter, with jointed segments around 2–5 cm long with whorls of side shoots at the segment joints; the side shoots have a diameter of about 1 mm. Some stems can have as many as 20 segments. The fertile stems are white, 10–25 cm tall and 3– 5 mm diameter, with 4–8 whorls of brown scale leaves and an apical brown spore cone 10–40 mm long and 4–9 mm broad. It’s deciduous. The dark-green, simple leaves are whorled. They are acicular with entire margins. They turn an attractive yellow in autumn.