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question about Wall O Water

I am new to gardening, well, new at least to sucessful gardening.  I have read
about Wall O Water but have never seen them in action.  I'm not sure how they
work.  The pictures in the catalog show plants growing out over the top.  Do
they first close the top untill the plants get too big or what?  I do
understand the physics involved a little like the energy required to make the
water change state, so I do kind of believe the advertising but protecting
down to 16 degrees, is that realistic?  
     I live in Boulder County Colorado at an elevation of about 5000 ft.  The
average last frost suppousedly occurs on May 6th.  When could I put seeds in
the ground, protected by these Wall O Water things to get a jump on the
weather?  I don't have the ability to start seeds indoors and then transplant,
for a number of reasons.  
     Thank you very much for any help that anybody may have for me.

MJ Aspen
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