In article , Roger Van Loon
writes
I think we are talking here about the winter hardiness of plants, and
then I'm sure the basic info about a certain plant is only to be found
in authoritative plant encyclopedias and dictionaries

I give up - we will just have to agree to differ.

I see no reason to publish USDA zones in books dealing with gardening in
the UK since the information they convey is incomplete, inaccurate and
therefore misleading in this context. You think the information is
essential.
Our opinions will never converge
--
Jane Ransom in Lancaster.
I won't respond to private emails that are on topic for urg
but if you need to email me for any other reason,
put jandg dot demon dot co dot uk where you see deadspam.com