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www.gardeningknowhow.com/.../poinsettia-cold-tolerance.htm

Poinsettias are native to Mexico, which means the United States Department of Agriculture poinsettia growing zones are only 9 to 11. But what is the actual cold hardiness of poinsettias? You need to know what temperatures can damage or kill your plant if you are using it as a garden accent. Is Poinsettia Hurt by Cold?

www.bobvila.com/articles/poinsettia-care

Some stores sell poinsettias in cellophane cones that will protect the plant from wind damage, but if it’s bitterly cold outside, the bracts and leaves could still suffer.

www.wikihow.com/Care-for-Poinsettias

Ideal temperatures for poinsettias don't reach above 70 °F (21 °C) during daytime hours or dip below 65 degrees at night. This is important in order to maintain the bright red color of the bracts. You should also avoid exposing the poinsettia to cold drafts, or to dry heat from radiators, appliances or open fires.

wenkegardencenter.com/quick-tips-to-keep-you-poinsettia...

Poinsettias are beautiful and easy to care for. Here are a few important things to remember to help keep your poinsettia looking cheerful until long after the holidays are done. Poinsettias can get cold damage very quickly. Keep them covered when transporting them to your home. If you see black edges on the bract, it is likely caused by cold damage during transporting home.

aggie-horticulture.tamu.edu/.../common-diseases-of-poinsettias

Note: Be sure to read and follow all label information when using disease control chemicals.. Remember that effective disease control involves anticipating plant disease, using stringent sanatation methods to exclude pathogen introduction, environmental modification to reduce plant infection by potential pathogens, as well as preventative sprays of effective disease chemicals.

edis.ifas.ufl.edu/ep349

Insects and Mites—Pests that attack poinsettias include aphids, mealybugs, soft scales, whiteflies, and spider mites. The poinsettia hornworm is a particularly serious problem, since it can rapidly defoliate an entire plant. If only a few are responsible for the damage, pick off and destroy them individually rather than spraying the entire shrub.

tucson.com/lifestyles/home-and-garden/save-your-poinsettia...

Poinsettias are sensitive to cold temperatures and outside placement during the winter months is not recommended when temperatures are below 55 degrees Leaf drop will occur if poinsettias are ...

www.thriftyfun.com/When-Do-you-Bring-a-Poinsettia-Inside...

Poinsettia plants can suffer cold damage once temperatures drop below 50 degrees Fahrenheit. This is a guide about, "When do you bring a poinsettia inside for the winter?".

answers.yahoo.com/question/index?qid=20070115040629AA0zGfc

I brought the poinsettia from work home to keep. Problem is it was brutally cold outside (minus 30 degrees C ---very very cold!) and while I fiddled with my keys to open the lock on my door my poinsettia was blasted by the frigid air for about 1 or 2 minutes. Anyway, now the plant looks really rough, all the leaves are wilted and the colour seems off.

robeson.ces.ncsu.edu/2018/01/cold-damage

Many of you will have cold damage in your lawns and landscapes. The signs of cold damage can be confusing, since some damage may not be evident until months later. Some leaves and tender shoots subjected to freezing temperatures or cold damage can appear water-soaked and wilted. These tissues will usually turn black within a few hours or days.