julia_shner Equisetum hyemale ssp. affine you imaged at Jerusalem Botanic Garden, is very frequently planted, for usual at ponds or creeks. Since Lena Glazunova asked if this was different from the nominative type: Yes, the ssp. from North America is for usual clearly larger, growing higher and thicker aerial shoots. There are some other differences, but in my opinion not sufficient for separation as distinct Equisetum praealtum