Ask Mr. Smarty Plants

First, here is a U. S. Forestry Services article on this plant.This article is a little difficult to read but we extracted this piece of information:

Next, read this article The Sensitive Plant by Dr. T. Umbrello, UCC Biology Department.

From that second article, especially note this paragraph:

"There are over 300 species of Mimosa that belong to the bean (pea) family Leguminosae.  This species, Mimosa pudica, is native to Brazil but is naturalized throughout the tropics of  the Americas, Africa, and Asia.  It runs wild as a weed in the Gulf States."

The Lady Bird Johnson Wildflower Center, home of Mr. Smarty Plants, is dedicated to the growth, propagation and protection of plants native not only to North America but to the area in whcih they are being grown; in your case, Rock County, on the southern border of Wisconsin. Since we have no information on this plant in our Native Plant Database, we really can't tell you if it would grow in Wisconsin. We have found no information that Mimosa pudica is toxic, but neither do we know if it is not.

So, we have to tell you that Mimosa pudica is not native to North America. It grows in North America, but is an invasive weed here. However, in our Native Plant Database, we do have Chamaecrista fasciculata (Partridge pea), which also has the common name of Sensitive Plant. This plant also has leaves that fold in when touched, if that was the feature you were interested in. You can follow that plant link to our webpage on it for more information. According to this USDA Plant Profile Map, it does grow natively in Rock County, WI.