Mimosa Tree Problems

Mimosa trees are recognized by the round clusters of pink or yellow flowers they produce.

Mimosa trees are also known as silk trees and have been growing in the United States since 1745. This ornamental plant is used in commercial and residential gardens for its showy flowers and appealing fragrance. Although it can be attractive in a landscape, mimosa trees are also very invasive and can spread rapidly, causing problems to surrounding plants and the landscape itself.

About

The mimosa tree is a deciduous tree and a member of the Fabaceae family. This tree matures to a height of 20 to 400 feet and features leaves that look much like those of a fern. From May through July, mimosa plants yield round clusters of small pink or yellow flowers. Each flower houses 5 to 10 seeds measuring 1/2 inch long.

Invasiveness

Mimosa trees adapt to a variety of different soils, making it capable of growing in almost any condition. Every flowering season results in the production of a large quantity of seeds, which can easily spread by air, animal or water. The germination of these seeds causes the rapid spread of the tree along roadsides, in vacant lots, and in both urban and suburban settings.

Alternatives

When considering planting mimosa for the ornamental or fragrant value, consider alternative plants that can achieve the same effect. Serviceberry, redbud, flowering dogwood, river birch, fringe trees, American holly and sweetgum trees are all non-invasive alternatives to the problematic mimosa tree.

Mechanical Control

Removing mimosa trees from the landscape is the best method in controlling the spread of the tree. To do this, use a saw to cut down the tree before it has a chance to flower. Because this tree easily resprouts, herbicides should be applied after cutting down the tree to minimize new sprouts. Seedlings which do appear can be pulled easily while they are young. When pulling seedlings, ensure that the entire root has been removed to prevent resprouting.

Chemical Control

Mimosa trees can be killed with the application of a 2 percent solution of either triclopyr or glyphosate. This solution, when combined with a non-ionic surfactant, can be applied to all the leaves. The chemicals will enter the plant through the leaves until it reaches the root system. As this chemical damages the roots the tree will be unable to absorb necessary nutrients and will die. Once the chemicals have killed the tree, it can be removed with less chance of resprouting or new seedling growth.

References

• University of Florida: Mimosa Tree