The mimosa or silk tree (Albizia julibrissin) is one of the invasive species people may encounter along roadsides and backyards. It is believed that the mimosa tree was brought to the United States in the 1700s by Andre Michaux, a French botanist. This tree is native to the Middle East and Asia and is a fast-growing tree, often reaching heights of 50 feet. It is adorned with pink blooms that usually appear May through July. The flowers are delicate and long with clusters of silky pink threads. They attract butterflies, bees, and hummingbirds. The leaves of the mimosa tree have a fern-like appearance. While this tree may be beautiful, it is also a highly invasive species that threatens the southern landscape.
The mimosa tree was introduced as an ornamental tree. Still, it escaped cultivation and is now growing in a variety of areas across the southeastern U.S. It competes with native species for light, water, and nutrients. It can be found growing along roadsides, along streams, in forests, and in clearings.
Songbirds are dependent on caterpillars and other insects that are typically found on native species to feed and rear their young. These food sources are becoming increasingly scarce because of the aggressive nature of invasive species like the mimosa tree, which edges out native species.
Due to the mimosa tree being so aggressive, good management practices are necessary. To begin the process of ridding a landscape of mimosa trees, people should cut them at ground level and use an herbicide, such as glyphosate, on the stump to prevent new growth. Glyphosate is most effective if painted on the stump as soon as it is cut.
Instead of the mimosa tree, try planting sourwood (Oxydendrum arboretum). This species blooms in the summer, and the flowers attract both native bees and honeybees. Another plant that blooms in June is buttonbush (Cephalanthus occidentalis). This large tree-like shrub needs moist soil and grows well in wet areas like pond and lake edges. It produces beautiful flowers in the summer that attract bumble bees and butterflies. Choose wisely and begin enjoying the native beauty of the region.