Every spring the school takes the students up the hill to plant trees.
Tips
mistakes
种 here is zhòng, the verb "to plant", not zhǒng "seed, kind". The same reading runs through 种田 (to farm), 种菜 (to grow vegetables) and 种花 (to grow flowers).
culture
The saying 前人栽树,后人乘凉 ("those before plant the trees, those after enjoy the shade") praises work whose reward goes to the next generation; people also say it with 种树. China's Arbor Day, 植树节, falls on 12 March.