Low-calorie sweetener made infamous by Breaking Bad using drones to increase yields

While most of the action in the agricultural drones space is devoted to flying cameras and other instruments used to monitor crop health, Stevia First Corporation, a company focusing on the industrial-scale production of stevia is taking another approach. Their crop scientists have determined that the stevia plant can be persuaded into increasing leaf biomass and steviol glycoside content through exposure to red lights overnight. Stevia First Corporation has thus deployed these red lights onto autonomous drones that will perform flyovers overnight and, in theory, increase their yields.

http://www.steviafirst.com/news/news_releases/2014/04/stevia-first-corp.-announces-plans-for-agricultural-drones-to-increase-stevia-leaf-yields