Amur honeysuckle, brought from Asia to the United States in the late 1800s as a landscape plant, spread quickly through the forests of Fort Harrison State Park as birds and small mammals carried its attractive red fruits, forming a dense shrub layer that crowded out native plants. When the first European settlers arrived in Indiana, much of the state was forest, but most of those forests were later cleared for farming, and many remaining forests were invaded by plants introduced from overseas either accidentally or for cultivation. The Indianapolis Zoological Society and Fort Harrison State Park are working together to remove Amur honeysuckle and to restore native species once crowded out, including spicebush, eastern ninebark, and native wildflowers such as Dutchman's breeches, jack-in-the-pulpit, trout lily, and Virginia bluebells.