The poem mainly talks about the surroundings and at the end of the poem it says 'sad songs of Autumn mirth' which means that this takes place in autumn. It also sounds like the poem is about gradening..
Key details and repeat themes throught the story
1. is D
2. is B
3. is A
4. is E
5. is F
6. is C
(I'm not so sure on 1 and 2 so tell me if I'm wrong on those ^w^)