What is the critical point for anti-freezing of domestic orchids?

Some say there is no need for antifreeze, and some say it must be frostproof. Which one is right? Why can wild orchids survive the low temperature of more than ten degrees below zero? Where is the tipping point of anti-freezing for domestic orchids?

Among orchids, Cymbidium has the strongest resistance, regardless of sun resistance, heat resistance, drying and freezing. So take cymbidium here as an example. Domestic cymbidium is cold-resistant and is not as cold-resistant as wild Huihui. Why? Because of the flowerpot.

If you have observed carefully, you should know that after snowing, the snow on the dirt road melts faster and earlier than that on the cement road, and the snow on the cement road melts faster than that on the cement bridge. This is the reason for the ground temperature. Orchids on the mountain take root in the earth, and there is ground temperature to protect them. Coupled with fallen leaves, snow and other mulch, the orchid root is basically protected from frostbite.

On the other hand, domestic potted orchids, like cement bridges, do not have any geothermal blessing. Once frozen, they will freeze as a whole, and Langen will surely die in the frozen state. This is the case with Huilan, not to mention other orchid species.

Domestic orchids need not only low temperature vernalization, but also anti-freezing. The tipping point of anti-freezing is defined as zero, and orchids will not suffer frost damage as long as it is not lower than zero. And once it's below zero, you don't have to challenge the low temperature. It's safe to get in as soon as possible.