In a nursery, you're going to find a lot of growth — and either babies or plants.
The word nurse is a clue to the meaning of nursery: nurses take care of people, and a nursery is a place of caretaking. One kind of nursery is for babies: it's a child's room with a crib and lots of baby toys. The other kind of nursery is for plants: this type of nursery usually has glass walls and a roof, plus everything plants need to be healthy. Nurseries keep plants or babies safe so they can grow.