SeeedStudio has popular products called Grove. It makes it easier for you to connect your board to various sensor and actuator devices. Currently, SeeedStudio provides the Grove Smart Plant kit for Arduino. This kit consists of temperature, humidity, soil moisture, and illumination intensity sensors. To connect these sensors, the kit provides a Grove Base shield that you can attach to Arduino.

You can buy this kit on the official website, https://www.seeedstudio.com/Grove-Smart-Plant-Care-Kit-for-Arduino-p-2528.html. One type of Grove smart plant care kit for Arduino is shown here: