Why is flowery language appropriate for a poem?

Flowery language consists in a very ornate and elaborated way of writing (and speaking) being contrary to the simple form of the language. In poetry, this kind of language works well due to the fact that it serves to create a more complex atmosphere and cause different sensations to the reader. Also, it beautifies the figure of the poet and the poem as a whole, making the author look like a virtuoso of the language.