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[Mandy]

Hi just getting started with keeping cacti and succulents, I have just bought my first little collection, but they didn't have name tags, there in the house at the minute but will be moving into my greenhouse, what temp do you keep your greenhouse above, thankyou

[KarlR]

Welcome to the forum!

Above 5-7 C is sufficient for most cacti, though some species (particularly from more tropical areas) need higher temps - above 12-15 C. A few species that are particularly cold hardy do best with freezing temps for optimal growth and flowering (mostly some of the North-American species from winter-cold areas of the US).

Unless you have pictures for us to see in order to give more detailed advice, I'd say over 7 C should see most species survive. The most common types where many or all species of a genus need higher temps are Melocactus, Epiphyllum (and most other epiphytes), and quite a few of the columnar species. There are certainly others but these aren't as common outside specialist nurseries.

[Phil_SK]

I aim for about 1C.

[Mandy]

Thank you, I will take a photo of them, I have three cacti and three alo veras

[Wilk]

In my cold greenhouse I seem to be able to get away with -5c. I suspect that more species than not can cope with a couple of degrees of frost??

Not wishing to be controversial (?) North American species are generally more interesting and cold hardy than many of their Southern counterparts.

[D^L]

If you are new to the hobby, Mandy, don't take Wilk's "uncontroversial" comment too seriously.
There are many cold hardy and fascinating plants from both North and South!
Cheers
David Lambie
Bristol

[Phil_SK]

With the equator running through it, South America was always going to have the lion's share of the more tender cacti, but most are tough. My 1C is for a cactus collection that's roughly 98:2 South:North.