Assertion: fern's root | /r/HasProperty | black
Facets:
Source sentences:
text: Cinnamon ferns have black and wiry roots that form a hardened mat in the soil.
text: The roots are black, wiry and fibrous, and sometimes used as a porous medium to mount tropical orchids.
text: If the roots are black and slimy, root rot is the culprit behind the yellowing leaves.