I think that I shall never see

A poem as lovely as a tree.

Although it is sometimes a good idea to begin a poem with a paradoxical thought, yours is quite confused. Your first sentence wrongly assumes that a meaningful comparison can be made between trees and poems in respect of their loveliness. But a tree is beautiful because its organic form delights the eye, while a poem's beauty lies in its expression of human thought and feeling, which is something quite different. There is no way to compare them, and the rest of your poetic effort proves the point, because all you do is slurp on about the tree, without even a nod toward great poetry. Perhaps you should try a course in the School of Business.