Assertion: black walnut's juglone | /r/HasProperty | active
Facets:
value: biologically
type: DEGREE
Source sentences:
text: Like other walnuts, the roots, inner bark, nut husks, and leaves contain a nontoxic chemical called hydrojuglone, when exposed to air or soil compounds it is oxidized into juglone that is biologically active and acts as a respiratory inhibitor to some plants.