Assertion: willow's root system | /r/HasProperty | aggressive
Facets:
Source sentences:
text: These specimens also should not be planted near sewer, septic tanks, or water lines: Their root systems are aggressive—sometimes stretching wider than the tree is tall—and not only do they seek out the nearest and most abundant source of water, but they are attracted to the nutrients in the soil around a septic system, as well as the oxygen in the drainage lines.
text: The root system is rather aggressive and can cause problems with drains.