Other plants absorb the toxic chemical and die. Leaching All plants lose leaves. Some plants store protective chemicals in the leaves they drop. When the leaves fall to the ground, they decompose. As this happens, the leaves give off chemicals that protect the plant.
Some plants release defensive chemicals into the soil through their roots.
Those chemicals are absorbed by the roots of other trees near the allelopathic one. As a result, the non-allelopathic tree is damaged.