The children are playing in the garden.
この園には桜の木がたくさんある。
There are many cherry trees in this park.
Metaphorical use for a bounded space or realm, often in set phrases like 学びの園 (place of learning). Not freely productive.
See also: 学びの園
学校は子供たちにとって学びの園だ。
School is a place of learning for children.
bamboo garden; the imperial family