However, no systematic comparison of effects of EOD-R and FR on shoot elongation and involved hormones in poinsettia has been reported.
In the poinsettia growing season in greenhouses (September–December) in northern areas, the R:FR ratio of natural sun light is decreasing at the EOD
Manipulation of the light quality at the EOD might thus provide an interesting, energy-efficient option for controlling shoot elongation in poinsettia.