( ( Weeds ( Any plant ) ) ( ( can ( be ( ( considered ( a weed ) ) ( when ( it ( is ( growing ( where ( it ( ( is not ) wanted ) ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NP (NNS Weeds)) (NP (DT Any) (NN plant))) (VP (MD can) (VP (VB be) (VP (VBN considered) (NP (DT a) (NN weed)) (SBAR (WHADVP (WRB when)) (S (NP (PRP it)) (VP (VBZ is) (VP (VBG growing) (SBAR (WHADVP (WRB where)) (S (NP (PRP it)) (VP (VBZ is) (RB not) (VP (VBN wanted)))))))))))) (. .)))
Weeds Any plant can be considered a weed when it is growing where it is not wanted.
(ROOT (S (NP (NNS Weeds)) (VP (VBP are) (NP (NP (NNS plants)) (SBAR (WHNP (WDT that)) (S (VP (VP (VBP grow) (SBAR (WHADVP (WRB where)) (S (NP (NNS people)) (VP (VBP do) (RB n't) (VP (VB want) (NP (PRP them)) (PP (TO to))))))) (CC and) (VP (MD can) (VP (VB take) (PRT (RP up)) (NP (NP (NN space) (CC and) (NN use) (NNS resources)) (SBAR (WHNP (WDT which)) (S (VP (VBZ hinders) (NP (NP (NN growth)) (PP (IN of) (NP (ADJP (RBR more) (JJ desirable)) (NNS plants))))))))))))))) (. .)))