The University of New Hampshire Cooperative Extension has conducted detailed research related to poinsettia cultivation and flowering. The research was funded by the Paul Ecke Ranch, the UNH Agricultural Experiment Station, and the Anna and Raymond Tuttle Environmental Horticulture Fund.

This research is useful to commercial growers as well as gardners and consumers caring for poinsettias.

Read more about the University of New Hampshire Cooperative Extension Poinsettia Site.