Please can I have a list of minimum temperatures by species?

[iann]

Lithops won't be harmed by any weather we'll hopefully get for the rest of this winter, although some species might possibly be damaged by a really cold snap. I find L. gracilidelineata and especially L. bromfieldii to be the least hardy, without having killed huge numbers to form that opinion.

Echeverias vary a lot, although most are actually quite cold-hardy. I leave my limited selection in an unheated greenhouse all winter.

Ferocactus also vary a lot. Some are fairly hardy, some quite tender. Although they tend not to mark as badly as E. grusonii (maybe some do?), they could easily lose their roots and then they'll sulk for two or three years until they grow them back (fingers crossed). I wouldn't panic about an occasional light frost.

[ralphrmartin]

There aren't many others I'd feel confident about. Obesa might, but is safer kept above freezing.

Euphorbias susannae, horrida and globosa were right next to the glass in my old greenhouse, and even though it was heated to 5C, it must have got pretty cold on occasion - they survived without issues.

[esp]

I've had Euphorbia horrida and E. tuberculata (= caput-medusa) in the cold frame this winter. They have seemed fine. No heating, no bubble wrap or extra cover during cold snaps. I'd cautiously extend to a few other species not already mentioned, but certainly not most members of the genus.

[Cactusgirl]

If you have any blue coloured cacti or any Melocactus I would keep them warmer than the others during the winter. My blue cacti are still small enough to stay in my propogator and the Melos are in my house during winter