Dormancy temperature genus by genus

[Zephyrmila]

I’ve divided my collection into 2 different rooms, one has a temp of about 8 C and the other one is my bedroom where I maintain the temp at around 12-15 C. In my warmer bedroom I left:
Cereus f.spiralis
Ferocactus schwartzii and emoryii
Melocactus Azureus
A number of pilosocereus
Vatricania guentheri
Myrtillocactus fukuro...
Copiapoa atacamensis
And 2 espostoas.

I wonder if this would be about right.....not sure about the espostoa, and also oreocereus trollii and cephalocereus senilis....?

Most of my collection is comprised of mammillarias ( about 80 maybe) and they all are in the colder room. Same with about 20 gymnocalyciums...

Sorry if this is such a pain in the a.... post
And thank you for any insight or help.

[esp_imaging]

I’d say only the Melocactus would need the higher temp. Oreocereus trollii would be happy with heavy frost if dry, it’s hardier than most Mamms.

[Zephyrmila]

Ok, thanks! I have them in the cooler room so they will stay there. How about pilosocereus? I read they need above 10 C.....

[anttisepp]

All brazilians and southern mexicans need above 12-15C. Oreocereus isn't frost hardy IMHO, there're no frosts in Bolivia.

[7george]

All brazilians and southern mexicans need above 12-15C. Oreocereus isn't frost hardy IMHO, there're no frosts in Bolivia.

You are wrong about Bolivia.
https://en.wikipedia.org/wiki/Oruro,_Bolivia
https://en.wikipedia.org/wiki/Potos%C3%AD

O. trollii is considered cold hardy up to -15°C but wintering at ~10 - 12 C is also fine.

[esp_imaging]

All brazilians and southern mexicans need above 12-15C. Oreocereus isn't frost hardy IMHO, there're no frosts in Bolivia.

Lots of Brazilians and southern Mexicans will certainly prefer warm temps. Some parts of Brazil do get frosts, but these are very much the exception.

Oreocereus celsianus / trollii are hardy, at least for moderate UK winter temps, so several degrees below 0C, if dry.

Remember Bolivia is very mountainous - a great many high altitude Bolivian species will regularly experience freezing temps.
https://www.bolivianlife.com/skiing-snowboarding/

Apparently La Paz can experience frost almost every month of the year, although winters are very dry and sunny:
https://www.meteoblue.com/en/weather/hi ... a_11494541