( It ( ( ( is not ) ( necessary ( to ( let ( ( the plant ) ( go dormant ) ) ) ) ) ) . ) )
(ROOT (S (NP (PRP It)) (VP (VBZ is) (RB not) (ADJP (JJ necessary) (S (VP (TO to) (VP (VB let) (S (NP (DT the) (NN plant)) (VP (VB go) (ADJP (JJ dormant))))))))) (. .)))
It is not necessary to let the plant go dormant.
(ROOT (S (NP (JJ Many) (NNS plants)) (VP (NN respond) (PP (TO to) (NP (NP (DT the) (NNS days)) (VP (VBG growing) (ADJP (JJR shorter)) (PP (IN in) (NP (DT the) (NN fall))) (PP (IN by) (S (VP (VBG going) (ADJP (JJ dormant))))))))) (. .)))
Many plants respond to the days growing shorter in the fall by going dormant.