Other devices as you will see can be changed upon voice commands. And Touch Somone may in the future mean more than it does now. When you study plants you soon discover that they have triggers which switch on and off just as electronic switchs. In hydroponics we monitered nutrients that was feed into beds and that which came back out with the drainage. What was discovered at the time of changes like when a plant would start to put forth leaves or fruit that certain nutrients were absorbed by the plants when they were not before these points in growth.
Some plants turn in respect to sun.