This is controlled by, both, genetics, and hours of light. These must be exposed to at least 12 hours of darkness to produce floral clusters, and color change. This article will help: https://www.gardeningknowhow.com/ornamental/flowers/poinsettia/poinsettia-care-how-do-you-take-care-of-poinsettias.htm
Answered on April 18, 2019
Was this answer useful?00
Looking for more?
here are more questions about...Poinsettia Plants