This is the 3648th most frequent Japanese word.
香る
"To smell fragrant" or "to emit a pleasant scent."
In this sentence, "香る" is used to describe the pleasant smell emanated by the flower during spring.
この花は春になると美しく香る。
This flower smells beautifully when spring comes.
Here, "香る" is implied in "香り," derived to describe an enjoyable fragrant characteristic of food.
香りが漂う料理を楽しむ。
I enjoy dishes that emanate an aromatic smell.
"香る" in this context refers directly to the act of the perfume emitting a pleasing scent.