We propose the concept of shape memory alloy motion display (SMD), a new type of physical display, and introduce an interactive art "plant" based on this technology. SMD is a display apparatus taking advantage of existence of an actual object, and gives visual expressions by movement and change in shape of actuators, which are components of this device. Visual expressions resembling tentacles of sea anemone and foliage of grasses and trees are possible by designing the actuators, making way for new expressions by physical display. We built the interactive art plant as a piece of art applying SMD technology. The plant is inspired by the vision of grass blowing in the wind. 169 artificial leaves react to hand's movement and moves slowly. We discuss the possibilities of SMD and the expression of trembling foliage through fabrication of the completed piece of art, plant.