Perennial

ве́чный

véčnyj

(continuing without cessation or intermission for several years, or for an undetermined or infinite period — see also perpetual, unceasing)

возвраща́ющийся

vozvraščájuščijsja

(appearing or recurring again and again — see also recurrent)

круглогоди́чный

kruglogodíčnyj

(lasting or remaining active throughout the year, or all the time)

многоле́тний

mnogolétnij

(of a plant: active throughout the year, or having a life cycle of more than two growing seasons)

повторя́ющийся

povtorjájuščijsja

(appearing or recurring again and again — see also recurrent)

постоя́нный

postojánnyj

(continuing without cessation or intermission for several years, or for an undetermined or infinite period — see also perpetual, unceasing)

многолетнее расте́ние

mnogoletneje rasténije

(plant active throughout the year, or has a life cycle of more than two growing seasons)