Allelopathy

Allelopathy is a biological phenomenon in which an organism produces one or more biochemicals that influence the germination, growth, survival, or reproduction of other organisms. Although the concept was originally developed to describe chemical interactions among plants, it has since been extended to chemically mediated effects between plants, microorganisms, and even invertebrates such as corals and sponges. Documented allelopathic compounds include juglone, produced by black walnut trees, and sorgoleone, produced by Johnson grass, both of which suppress the growth of competing plant species, while volatile compounds released by big sagebrush can inhibit seed germination in nearby plants. This description is adapted from Wikipedia contributors under CC BY-SA 4.0; changes were made. https://creativecommons.org/licenses/by-sa/4.0/