Sensitive Plant. It is a fun plant to grow. The leaves fold up when touched. If touched with a bit more force, the petioles will also bend at their pulvinis and the leaves droop. These movements are called seismonastic movements (reaction to physical shock). At night, the leaves will also fold and bend in movements known as nyctonastic movements (reaction to absence of light). It is a wonderful groundcover, can integrate with grass and pink powderpuff flowers stick out of grass - very showy! Can be mowed over with no damage to established plants.