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Weed control using Bay laurel leavesFeatured science projectScience project video


Our hypothesis was that the higher the concentration of  Bay laurel leaf juice, the faster the weeds would be killed - has been  proven to be correct.

The use of synthetic weed killers is known to be a health hazard to the environment. These herbicides leach into ground water and causes contamination of the water table. Ponds and rivers become contaminated and endanger the lives of organisms . The use of allelopathic plants to combat the weed problems is a safer and eco-friendlier solution.

Also consider

This science project can be repeated using different types of allelopathic plants like the California buckeye. Also, try comparing the difference in effectiveness between natural vs. synthetic weed killers.


Allelopathy in gardening -

Allelopathic plants: nature’s weed killers -

Umbellularia Californica -

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Complexity level:
Project cost ($):
Time required:
2 hours to prepare, 12 days for science fair project
Material availability:
May be purchased from a plant nursery
Safety concerns:

Handle chemicals with care and dispose of them properly. Wear safety gloves and goggles to prevent injury