The message
from Flower Bobdew contains these words:

Anyone who says to keep them above 5 Celcius is talking twaddle.

Ahem... Amongst a lengthy swathe of advice which actually came with the
tree when I bought it last year, and I quote: "...[leave] outside as
long as it does not freeze. Just remember to put it inside when the
frost comes."

A case of CYA.

Bay trees look *LOVELY* at Christmas when sparkling with frost...

--
Rusty