There might be some confusion because in the poem, Kilmer uses the line "I think that I shall never see / A poem lovely as a tree." This line highlights the beauty and simplicity of trees, contrasting them with the more complex and potentially artificial nature of poetry. It's possible that someone might interpret this line as Kilmer implying he's not a skilled poet, but that's not the intention.
The poem "Trees" is a celebration of nature's beauty and is considered a classic example of nature poetry. Kilmer's choice of title directly reflects the subject of his poem and doesn't imply any self-deprecation.