Assertion: black walnut | /r/HasProperty | fertile
Facets:
Source sentences:
text: Black walnuts can self pollinate or be self fertile, but you will get better yields if at least two trees are near each other for better cross pollination.
text: The black walnut is self-fertile, but the sequence of male and female blooming, called dichogamy, can and often does minimize chances of a tree shedding pollen on its own pistils.