allelopathic

Science Dictionary
allelopathy   (ə-lē-lŏp'ə-thē, āl'ə-)  Pronunciation Key 
The inhibition of growth in one plant species by chemicals produced by another. For example, other plants will often not grow underneath black walnut trees, since these trees produce juglone, a chemical inhibiting plant respiration.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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