In this paper, we introduce the versatile creative tool called "I/O Plant" which generates new-style interactions among humans, plants and computers. It enables designers to manipulate plants as modules by attaching actuators and sensors to plants. It has been designed to create original hybrid circuits. We report not only our tool, but also use patterns and several examples. I/O Plant cultivates new creativity toward the interaction design. Keywords plants, interaction, ambient interface, biological signal. ACM Classification Keywords B.4.2 [Input/Output Devices], H5.2 [Information interfaces and presentation]