Children around the country are working with scientists from the University of Otago to discover new uses for the mānuka tree.
Around 30 schools have joined the study.
Students are looking at the chemistry of the leaf of the plant to see if it could produce another product from the tree.
The primary and intermediate students are investigating if the leaves could be used as a natural weed killer.
Results from the first lot of testing are being collated and it is hoped the project will be extended to more schools in coming years.