They don't change their colors with the seasons if you were hoping that very special quality.

They are electroplated and, like all plated goods, will lose the finish with wear, body acids, chemicals and abrasion. The loss on bright finishes will be more noticeable than on the antiqued finishes.
The electroplated leaves are real leaves under the layers of metal so they are a little fragile although probably less fragile than an unplated leaf.
Does that help?