The chemical warfare between plants, where one species releases toxic compounds that inhibit the growth or germination of competing plants. Black walnut trees are famous for their allelopathic effects on nearby vegetation.
From Greek 'allelon' (of each other) and 'pathos' (suffering) - literally meaning 'mutual suffering.' The term was coined by Austrian botanist Hans Molisch in 1937 to describe plant-to-plant chemical interactions.
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