Our series on the native trees of Chicago is back this week as we take a closer look at a tree that is beautiful and loved throughout the Chicagoland area, the elm tree.  Elm trees are very hardy trees that can withstand tough conditions and they are valued for their shape, shade, and natural beauty as ornamental trees.  Elms, especially American elms, were very popular trees to plant in cities like Chicago that grew and developed in the 19th...