Poinsettias

[Marck]

yes, heard they grow wild in their native habitat .

They also grow outdoors as garden plants, or occasionally as escapes, in other warm and temperate regions. For example, the photo posted above was taken along a road in Ventura Co., California. Euphorbia pulcherrima is native to warmer parts of Mexico and Guatemala.

 

[Oliver Buckle]

I kept one growing for well over a year in an indoor windowsill box once, but it turned green and stayed green. In this country the colour is always 'forced' in some way.

 

[Marck]

They require long nights to initiate flowering. Perhaps, there was too much ambient light at night around the indoor window box.
I understand that the amount of long night exposure needed varies with cultivar and that temperature also plays a role.

 

[LouisFerdinand]

Do Poinsettias only bloom at 50 to 60 degrees or higher?

 

[Marck]

For the most part, they need warm temperatures as they are tropical plants, but excessively high temperatures will also prevent flowering.

 

[LouisFerdinand]

The many varieties in poinsettia colors