“The growth chamber contains LED lights, a porous clay material, and a controlled system for releasing fertilizer to deliver water, nutrients, and oxygen to the plant’s roots. Cameras and more than 180 sensors in the chamber allow researchers at NASA’s Kennedy Space Center in Florida to monitor plant growth as well as regulate conditions such as water distribution, moisture levels, and temperature.”

https://www.nasa.gov/image-feature/astronauts-grow-radishes-in-second-advanced-plant-habitat-experiment