"past season fly away"... past seasons fly or past season flies

I think you should make each season its own stanza. I think that format would really work well to separate them and make the repetition seem less well... repetitive... lol.

I do like the repetition though. Especially, blossoms that was a nice way to tie them all together. (Maybe that's just part of it being a tanks?)

Your descriptions of the seasons were nice as well. Great piece.

PS If you're bored check out the Review Game and/or its Review Marathon (link in my profile).

This was a nice little poem. You manage to put the essential mood of each season into a few words. Very good!