The Law of Ueki

The Law of Ueki (うえきの法則, Ueki no Hōsoku) is a Japanese manga series written and illustrated by Tsubasa Fukuchi. It was serialized in Weekly Shōnen Sunday from August 2001 to October 2004. Sixteen tankōbon volumes were compiled and published by Shogakukan. A manga sequel, The Law of Ueki Plus was serialized in Weekly Shōnen Sunday from April 2005 to July 2007.
An anime television series adaptation produced by Studio Deen was first broadcast on TV Tokyoin April 2005, and ended with 51 episodes in March 2006. 
The manga was licensed for distribution in North America by Viz Media, while the anime adaptation was licensed by Geneon and later by Discotek Media in 2018.