1936 usda zones, US

Shmuel Silinsky gardenbetter@gmail.com
Wed, 10 May 2017 01:23:13 PDT
This is a great thread. Here in Isreal we are a country the size of New
Jersey that goes from alpine (Mount Herman - which has a ski resort) to
extreme desert in the south and everything in between. The PBS wiki page
that Norman gave is fantastic. I had not seen it before - there are truly
hidden treasures here.

Norman wrote:









*FYI for new list members, there is a zone system for summer-dry climates
onthe
http://…
<http://pacificbulbsociety.org/pbswiki/index.php/…>Even
that is just an approximation, of course, since it doesn't take intoaccount
things like soil type and moisture from fog. But it's a startingpoint to
understanding the native climate of a particular summer-dormantbulb.*

One thing I have never really understood (only one?) and if it could be
explained Iwould really appreciate it. The chart combining cold and wet has
Coldest Winter Month lows average. This is a puzzle to me as to how to use
that info. Is it the average of coldest temp for that month? Isn't the
actual lowest temperature more impiortant? I live in Jerusalem - C3 on the
chart which has lows average of 40-45 F. Yet we have consistently weeks
with nights at freezing, one or two snows a year, sometimes getting a few
inches. Definitely frosts. That is generally the limiting factor for most
gardening. Is it that geophytes nestled in their insulating bed are more
affected by the average than the air temp? Of course, when those cold snaps
happen, the winter growers are already above ground...

I have seen average lows on many charts and just do not understand how to
use it.

Thanks!
Shmuel Silinsky
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