Despite being written in common and simplified language, "Some Trees" is incredibly difficult to make sense of. The five stanzas, despite their separation, are almost all connected with various instances of enjambment, making the poem flow with an odd rhythm and its ideas string together with nebulous threads. Ashbery is famous for being nearly incomprehensible, but on the Ashbery spectrum, "Some Trees" isn't too bad, so some meaning can perhaps be gleaned from these lines.
We can presume that the narrator is looking at a grove of trees, an assumption made based on the title and the general subject of the poem. Also, from the pronouns "we" and "us," along with the phrase "you and I," we can say with relative confidence that the narrator is not alone, being accompanied by an unnamed person of unidentifiable gender. He begins the poem by describing the amazing arrangement of the trees, who comfortably join their neighbors without the motion-driven use of artificial speech. This content coexistence is perhaps illustrated as a model for true companionship, as the theme of relationship comes out later in the poem.
It is possible that these people have met by chance by the trees ("Arranging by chance / To meet as far from the world as agreeing / With it"), or that the destination is random. Either way, the meaning is relatively straightforward: the trees are telling them that simply being together is something to notice and revel in. Camaraderie is under-appreciated; the mere state of being in any sort of relationship with another person is worthy of awe-filled contemplation. Living in this contented state, the narrator and his companion are surrounded by "a silence filled with noises." The world is silent and serene, but in the stillness, elements of the scene take on an almost auditory quality. Smiles fill in major chords, and the winter air is almost audible in its crisp coolness. The specific meaning of all of the poem's elements is uncertain, but at any rate, it's a call to dwell on the amazing phenomenon that is community with another person.
