A plant native to Mexico, the part that looks like a flower is the bract, and the flower is the yellow part inside the bract. In Japan, it is a plant that appears at Christmas, but since it is native to Mexico, It prefers a warm place.
It seems that flower buds will form when the day gets shorter, and if you want to color it early, you should cover it with cardboard. The method is as follows.
It's a short-day process, and it starts two months before you want to color it. From 5 pm to 7 or 8 am the next morning, cover it with a cardboard box to darken it. Continue processing until the bracts are completely colored.
Next fall, on the contrary, I would like to grow it naturally and observe whether it will be colored.