Yawancin tsire-tsire masu tsire-tsire da kuma tsire-tsire masu tsire-tsire suna buƙatar vernalization zuwa flowering. Fassarar kwayoyin halitta na waɗannan sigina shine ta hanyar watsa sigina mai rikitarwa da aka sani da florigen, wanda ya haɗa da nau'ikan kwayoyin halitta, gami da Constans, Flowering Locus C da flowering Locus T. Ana samar da Florigen a cikin ganyen tushe a cikin tushe kuma yana aiki a cikin buds da tip don fara yawan adadin kwayoyin halitta da kuma nau'ikan halittu na jiki, don haka tabbatar da nasarar haifuwa mafi girma. Don saduwa da waɗannan buƙatun shuka na iya fassara mahimman alamun endogenous da na muhalli kamar canje-canje a cikin matakan hormones na shuka da sauye-sauyen yanayi da yanayin zafi da sauye-sauye na photoperiod.
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