Wind

[Kynaston Levitt]

Acorns collecting
Reflecting tree branch shadows
Sticking together

The collecting/reflecting rhyme sounds out of place, to me—as well as using 3 present continuous verbs. I appreciate you are going for the 5-7-5 approach but you may consider changing "reflecting" to "reflect".
Other than that, I actually don't mind the contradiction of shadows being reflected. Normatively speaking it's hardly even a contradiction. And the shadows of tree branches sticking together is a beautifully simple articulation of a mute observation I am sure we've all made. I've no doubt that from now on whenever I witness this phenomenon I will recall this line.

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 you changed it completely. Oh well, fair enough. Serves me right for not learning to type with more than one finger.