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I found it can survive -6 °C. But that's not clear, is -6 °C for 2 weeks still fine? Is -2 °C for a week still fine? In both cases, it means 24/7 frost, it's not the same as temporary temperature fall and day temperature above 0.

So far, after 3 day long 24/7 frosts -4 night and -2 day everything is fine, alive and still green, it looks healthy.

Do you have any experience with that?

After 3 days 24/7 frost and one week without frost: enter image description here

I think it's damaged a bit, some leaves are black, what do you think?

Now (May 12):

enter image description here

user1209216
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1 Answers1

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It's not even December yet, and seems likely that you'll have colder weather in January/February; at least that's the way it works anywhere I have experience with that goes below freezing in November. So digging it up and potting it to keep inside for the winter while it's still not dead is likely better than waiting until after it's dead.

Have had good results from digging up and potting rosemary for the winter in zone 4/5 and complete death for any left outside (or in an unheated tunnel) through winter.

If you can't manage/fit the entire plant indoors, take cuttings and root them; just take more cuttings than you expect to need so any that don't root will not be a large impact; if more survive than you've allowed for, give some away.

Ecnerwal
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