Mimosa pudica – Sensitive Plant, Touch-Me-Not Plant, Shameplant, Sleeping Grass, Humble Plant

Description

Mimosa pudica is a small, short-lived perennial or annual herb famous for its remarkable leaf movement response. Native to tropical regions of the Americas but now widely naturalized in many warm climates, the plant typically grows 30 to 60 cm tall with slender, branching stems that may become slightly woody at the base. The finely divided, fern-like leaves fold inward and droop when touched, shaken, or exposed to sudden changes in light or temperature, a defense mechanism known as thigmonasty.

During the growing season, the plant produces small, spherical flower heads composed of numerous tiny pink to lilac filaments, giving them a soft, fluffy appearance. After flowering, small seed pods develop. Mimosa pudica grows best in full sun and warm conditions, preferring well-drained soils and moderate moisture. It is often cultivated as an educational or novelty plant due to its rapid leaf movement.

Sow seeds in spring to early summer when temperatures are consistently warm, ideally between 22 to 30°C. Lightly scarifying or soaking the seeds in warm water for several hours before sowing can improve germination. In tropical climates, seeds may be planted throughout the year if warmth and moisture are available.