Zakken!

It's already in the middle of the spring of Yukari's first year of high school, but she still hasn't found anything she can become absorbed in. That's when she meets the weed-obsessed Mimi (nicknamed "Chameleon Plant-chan"), and the two of them start the "Weed Research Club" or "Zakken"! Through the help of Hibiya High School's Weed Research Club in Tokyo, this is the story of real high schoolers who have fun learning about plants and vegetation in their school club. Source: Shogakukan