g'day bruce,

frosts can occur anywhere from 5c ambiant temp (at that ground temp
might be zero or a little above) down if conditions are right that is
dew and the cold pool of air, also black frost occur with a cold front
usually up here it passes through in the middle of the night so plants
can be damaged before you wake up.

for white frost you can cover sensative perennials with old bed sheets
or some loose hay over the top. once most plants reacn a height of say
1.7 meters they are getting out of the frost zone effects.

now with edible ginger it dies off for winter so the frost won't
affect it, but the ground temp will so if you mulch very heavily say a
foot or thereabouts jsut before the end of autumn or the plant dies,
then the ground will be insulated and stay warm enouhg to preserve the
corms, or you need to lift the corms to over winter them.

so if you want a ginger that will be evergreen even in frosts then try
gal-n-gal aka indonesian ginger.


On Wed, 30 Jul 2008 22:04:43 -0700 (PDT), brucef
wrote:

snipped
With peace and brightest of blessings,

len & bev

--
"Be Content With What You Have And
May You Find Serenity and Tranquillity In
A World That You May Not Understand."

http://www.lensgarden.com.au/