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Re: Winter Dormancy

  • Subject: Re: Winter Dormancy
  • From: "W. George Schmid" hostahill@Bellsouth.net
  • Date: Sun, 9 Jan 2005 09:25:49 -0500

Chick,
In Florida do like the Italians. They pot their H. plantaginea and raise
them on pedestals. In northern Italy, say from a line (east-west) 50 miles
south of the Po River the air gets pretty cold in winter and that air
chilling is enough to be able to grow it. They even have snow from time to
time (Rare!) It blooms abundantly if given plenty of water in late
July/August. It hails from 27 degree North in China (my garden is 34 degrees
North) so is used to hot weather and warm nights. I'd say that Tampa-St.
Augustine might be a southernmost line for it. Remember, the August lily is
an exception. All other hostas might grow into USDA zone 8. I have seen
plenty in Charleston, Savannah, Brunswick, Jacksonville and into the eastern
panhandle. George
W. George Schmid
Hosta Hill - Tucker Georgia USA
Zone 7a - 1188 feet AMSL
84-12'-30" West_33-51' North
Outgoing e-mail virus checked by NAV
----- Original Message -----
From: "Chick" <chick@bridgewoodgardens.com>
To: <hosta-open@hort.net>
Sent: Saturday, January 08, 2005 4:07 PM
Subject: Re: Winter Dormancy


> Thanks.  I really couldn't find a way to make that 700 hours thing work
> for me unless they have more hours of cold weather in the South than I
> thought.
>
> Do you have any idea how far south in Florida it might be worth trying
> to grow plantaginea?  I have lots of people from the retirement areas of
> Florida asking me whether they can grow hostas and I usually tell them
> no. I don't grow plantaginea because it drives me nuts here, but I
> wonder if some of them might have a chance with it.
>
> Chick
>
> W. George Schmid wrote:
>
> >Climate of Japan - Hosta dormancy
> >
> >The ocean climate of Japan is wet and humid and has four distinct
seasons.
> >Hokkaido and other parts of northern Japan have long, harsh winters and
> >relatively short cool summers. Average temperatures in the northern city
of
> >Sapporo dip to -50C/23F in January but reach only 200C/68F in July.
Central
> >Japan has cold but short winters and hot, humid summers. In Tokyo,
> >temperatures average 30C/39F in January and 250C/77F in July. Kyushu is
> >subtropical, with short, mild winters and hot, humid summers. Average
> >temperatures in the southern city of Kagoshima are 70C/45F in January and
> >260C/79F) in July. Hosta grow there too! Farther south, the Ryukyu
Islands
> >are warmer still, with frost-free winters - no hostas there!
> >There are  many other factors: elevation (the above temps are at seacoast
> >towns), total precipitation, timing of precipitation, soil temperatures,
> >soil freezing depth, night temperatures, duration of snow cover, and
shade.
> >Spring shade delays soil warming - spring sun advances it. I would say
soil
> >temps are the most important. To say 700 hours below 40 is not science.
They
> >grow hostas in subtropical Italy, but they put them in pots to be exposed
to
> >the much colder night air temps. Another factor is genetic and how the
> >species have adapted to warmer climates. The central and southern
Japanese
> >hostas do fine in the South given enough summer moisture. Did the
cultivar
> >come from southern species or from northern ones? Or did a particular
clone
> >of H. montana come from the North or South in Japan. They grow all over.
> >Hostas have a high degree of adaptability. One key seems to be dormancy.
> >Delayed dormancy might affect growth rates. If the temps are low enough
to
> >trigger normal autumn dormancy, the hostas will probably grow there. If
they
> >get abundant rain in August/September as they do in Japan (not here in
the
> >USA), they can stand higher summer and night temps. No rain and above
> >350C/over 90F)during late summer/early fall can make them go heat dormant
> >and they will lose a seasons root growth, hence they will decline (as
here
> >in the South). But given plenty of moisture in late summer in southern
> >regions seems to make up for the shorter winter cooling periods and
earlier
> >soil warm-up. Up north they may have enough "chilling" but if they dry
out
> >during the critical root growth period they suffer too. It is a
combination
> >of factors!
> >There are no fast and hard numbers because no one has scientifically
> >determined what they might be. This would be quite a task, because so
many
> >factors impact the growth rates and survival rates. If anyone out there
has
> >real numbers, determined scientifically, I would like to know about them.
> >George
> >
> >W. George Schmid
> >Hosta Hill - Tucker Georgia USA
> >Zone 7a - 1188 feet AMSL
> >84-12'-30" West_33-51' North
> >Outgoing e-mail virus checked by NAV
> >
> >----- Original Message -----
> >From: "Chick" <chick@bridgewoodgardens.com>
> >To: <hosta-open@hort.net>
> >Sent: Friday, January 07, 2005 11:17 PM
> >Subject: Winter Dormancy
> >
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>
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