( ( A weed ) ( ( is ( ( any plant ) ( growing ( where ( it ( ( is n't ) wanted ) ) ) ) ) ) . ) )
(ROOT (S (NP (DT A) (NN weed)) (VP (VBZ is) (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 is 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)))) (. .)))