This is the 1379th most frequent Polish word.
rosną
"Rosną" means "they grow" in English.
Rosną (are growing) denotes the process of growth happening to the trees in the present tense.
Drzewa w lesie szybko rosną.
The trees in the forest are growing quickly.
Rosną (keep increasing) refers to the constant increase in the value of products.
Ceny produktów ciągle rosną.
The prices of products keep increasing.
Rosną (grow so fast) describes the rapid physical development of the children observable over time.