Perennial

eeuwig

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

eeuwig

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

gansjarig

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

meerjarig

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

voortdurend

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

meerjarige plant

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