because otherwise it's too it gets if you start them when it's cooler in the spring then it gets too hot in the summer
( because ( otherwise ( it ( 's ( too ( it ( gets ( if ( you ( ( start them ) ( when ( it ( ( ( 's ( cooler ( in ( the spring ) ) ) ) then ) ( it ( gets ( too ( hot ( in ( the summer ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) )
(ROOT (SBAR (IN because) (S (ADVP (RB otherwise)) (NP (PRP it)) (VP (VBZ 's) (ADJP (RB too) (SBAR (S (NP (PRP it)) (VP (VBZ gets) (SBAR (IN if) (S (NP (PRP you)) (VP (VBP start) (NP (PRP them)) (SBAR (WHADVP (WRB when)) (S (NP (PRP it)) (VP (VBZ 's) (NP (NP (JJR cooler)) (PP (IN in) (NP (DT the) (NN spring)))) (ADVP (RB then)) (SBAR (S (NP (PRP it)) (VP (VBZ gets) (ADJP (RB too) (JJ hot) (PP (IN in) (NP (DT the) (NN summer)))))))))))))))))))))
You should start them during Spring if you want them to be cool during the summer.
( You ( ( should ( ( ( start them ) ( during Spring ) ) ( if ( you ( want ( them ( to ( be ( cool ( during ( the summer ) ) ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (PRP You)) (VP (MD should) (VP (VB start) (NP (PRP them)) (PP (IN during) (NP (NNP Spring))) (SBAR (IN if) (S (NP (PRP you)) (VP (VBP want) (S (NP (PRP them)) (VP (TO to) (VP (VB be) (ADJP (JJ cool) (PP (IN during) (NP (DT the) (NN summer)))))))))))) (. .)))