Sweet pea stems

Why do they get shorter as the Sweet Pea season wears on? At first, the flowers have nice long stems, but as the season draws to a close, stems are much shorter.
Inquiring minds...
HB
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I wish somebody would answer this. Have been wondering about it for decades, every time their season draws to a close.
HB
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In article

and structure followed by an emphasis on flower and seed production as light intensity and photoperiod increase.
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