Plants as medicine could be another interesting topic

"Aspirin, morphine and chemotherapy: essential medicines powered by plants" | Natural History Museum

https://www.nhm.ac.uk/discover/essential-medicines-powered-by-plants.html

This might be harder to access...

https://www.nationalgeographic.com/environment/article/this-in-demand-plant-is-evolving-to-hide-from-human-predators