( ( A weed ) ( ( may ( be ( defined ( as ( ( any plant ) ( growing ( where ( it ( ( is n't ) wanted ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (DT A) (NN weed)) (VP (MD may) (VP (VB be) (VP (VBN defined) (PP (IN as) (NP (NP (DT any) (NN plant)) (VP (VBG growing) (SBAR (WHADVP (WRB where)) (S (NP (PRP it)) (VP (VBZ is) (RB n't) (VP (VBN wanted))))))))))) (. .)))
A weed may be defined as any plant growing where it isn't wanted.
(ROOT (S (NP (NP (NNS Plants)) (SBAR (WHNP (WDT that)) (S (VP (VBP grow) (SBAR (WHADVP (WRB where)) (S (NP (PRP you)) (VP (VBP do) (RB n't) (VP (VB want) (NP (PRP them)))))))))) (VP (VBP are) (VP (VBN called) (NP (NNS weeds)))) (. .)))