Ask Amy: Must I clean up the leaves in my neighbor's yard?

Dear Amy: Years ago, I planted a tree in my yard that was very close to my property line.The tree has grown a lot.It has small leaves, and this year the leaf fall is large.It is a pain to clean up.Many of the leaves are falling into my neighbor's yard.My neighbor has no trees in her yard.All the fallen leaves in her yard are from my tree.

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