Background: Automation is starting to dominate the world today. We are entering a new era of computing technology, the Internet of Things (IoT), which is experiencing rapid development. IoT is a worldwide neural network in the cloud that connects a mixture of things, aiming to maximize internet connectivity benefits in transferring and processing data. Using IoT, one can monitor and control a device remotely with a computer or smartphone. IoT can apply in various fields, one of which is the smart garden. Objective: This research aims to design an automatic plant’s watering system used in small gardens in houses. Smart Garden is an electronic control and garden monitoring system for the process of watering plants so that it can help people care for plants. Method: This paper presents a design of the Internet of Things for small gardens inside houses using Wireless networks and sensors. In automatic watering plants, information about soil moisture is needed for plants. Sensors are devices used for smart agriculture. Arduino Uno will control all system operations as monitoring the plant watering system. Result: The result of this paper is a Plants Watering System Design for Small Garden at Homes.