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Yes, manzanita bushes [Arctostaphylos spp] put a toxin in the ground. The toxin's presence doesn't keep bushes and trees from being planted in the area. But depending upon the variety, it may keep them from doing well. This adverse effect on neighboring plants is called 'allelopathy'.

Specifically, manzanita contains coumarins. The environmental presence of coumarins readily is identifiable by the toxin's sweet, freshly mown hay smell. It also may be witnessed by its disruption and slowing of growth in other vegetation in general, and in grasses and herbs in particular.

In fact, coumarins are natural weed killers and pesticides. But their effects may be weakened by effective aeration, drainage, microbial activity, soil type, and temperature. For example, their impact is stronger in poorly draining clayey soils and weaker in fast draining, sandy ground.

Manzanita isn't the only plant to contain coumarins. Other examples are woodruff [Galium odoratum], vanilla grass [Anthoxanthum odoratum], tonka bean [Dipteryx odorata], sweet grass [Hierochloeodorata], and mullein [Verbascum spp].

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