Sugina is Equisetum arvnense.
In Japan, early spring Sugina grows everywhere. They are infamous cannot exterminate. Although nowadays Sugina tea, that is dried Sugina is in boom. Because they say Sugina tea cures pollinosis though there is no clear evidence. Sugina is used as diuretic agent from forefathers.
Their flavor is similar to lemongrass, but not so much lemon like. As for tea, it taste smooth, make me refresh. You can use Sugina tea as bath additives. It makes your skin smooth.