The poem
Fall, leaves, fall; die, flowers, away; Lengthen night and shorten day; Every leaf speaks bliss to me Fluttering from the autumn tree.
I shall smile when wreaths of snow Blossom where the rose should grow; I shall sing when night's decay Ushers in a drearier day.

Only 8 lines but it says much. She seems to be ordering the leaves to fall and the flowers to die with use of imperative statements. Emily Bronte obviously loves the winter because it makes her happy - not the usual sentiment about cold English winters. She cannot wait for winter to come, even at the expense of the beautiful rose a symbol of England and summer.
Fall, Leaves, Fall
It means that a new season is coming, winter, and she doesn’t want it to. She’s talking about how in winter the days are shorter; it gets dark earlier, so nights are longer. She also talks about how the leaves are falling off and the flowers are dying away, and how the snow is starting to cover the grounds, where a rose should really grow, and how winter is a dreary season. And she DOES NOT like winter.
At first, it seems that she was sad that the leaves were falling but she isn't. Just look at the second verse and end of the first verse. She is excited that winter is coming because it brings about a whole new world.
i love this poem pick it for my environment project