Editing Willow (section)

===Weeds===
Willow roots spread widely and are very aggressive in seeking out moisture; for this reason, they can become problematic when planted in residential areas, where the roots are notorious for clogging [[French drain]]s, [[Drainage system (agriculture)|drainage systems]], [[weeping tile]]s, [[Onsite sewage facility|septic systems]], [[storm drain]]s, and [[sanitary sewer|sewer systems]], particularly older, [[Pipe (fluid conveyance)#Materials|tile, concrete, or ceramic pipes]]. Newer, [[Plastic pipework|PVC sewer pipes]] are much less leaky at the joints, and are therefore less susceptible to problems from willow roots; the same is true of [[water supply]] piping.<ref>[http://hort.ufl.edu/trees/SALSPPA.pdf Salix spp. UFL/edu], ''Weeping Willow'' Fact Sheet ST-576, Edward F. Gilman and Dennis G. Watson, [[United States Forest Service]]</ref><ref>"[http://www.extension.umn.edu/yardandgarden/YGLNews/YGLN-Oct0103.html#roots Rooting Around: Tree Roots] {{Webarchive|url=https://web.archive.org/web/20120419055738/http://www.extension.umn.edu/yardandgarden/YGLNews/YGLN-Oct0103.html#roots |date=19 April 2012 }}", Dave Hanson, ''Yard & Garden Line News'' Volume 5 Number 15, [[University of Minnesota Extension]], 1 October 2003</ref>