Garlic question

[WestHamRon]

The received wisdom appears to be that garlic requires sub-zero temoeratures to split.
The garlic bulbs I've just bought from Tesco come from Spain.
Are these from a very rare area of Spain that actually has sub-zero temperatures or is the received wisdom wrong ?
Your thoughts please.

[Geoff]

We have discussed this a time or two for example viewtopic.php?f=3&t=12182&hilit=garlic

Personally I think it is nonsense; among many things, how deep do you plant garlic and how often does the frost penetrate to that depth?

[WestHamRon]

Thanks, Geoff.
A load of cobblers then.