Is the threshold size for flowering in Cynoglossum officinale fixed or dependent on environment?

boraginaceae dimension dimensions drug plants environmental factors facteur du milieu factores ambientales fleur floraison flores flowering flowers ga gibberelline inflorescence inflorescences inflorescencias malezas mauvaise herbe paclobutrazol plant growth substances plantas medicinales plante medicinale plasticity rheological properties size sustancias de crecimiento vegetal temperatura temperature vernalisation vernalization weeds