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[Fwd: Protecting tropicals in a Greenhouse]

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Posted by jeff on December 5, 2009, 12:16 am
 
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  Oops, left out the thermal in the original posting.

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Newsgroups: rec.gardens,alt.solar
Subject: Protecting tropicals in a Greenhouse
Date: Fri, 04 Dec 2009 11:23:43 -0500
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I'd like to protect a few tropical type plants, including a hibiscus and
a palm. I'm in Atlanta, 7b. I don't want to bring them in, if possible.

I built a small (south facing) green house (I call it the solar cabana)
out of 2*2's. It's about 8'*8' and has an arched roof of pvc pipe. Front
is higher than the back. The back half of the top has an inside layer of
bubble wrap. The outer walls (non south facing) are double plastic (poly
on both sides of the 2*2's) and the back is a polisocyanurate sheet. The
floor is salvaged brick. A rough guess (not including the floor) is a
thermal conductance of 165 BTU's F. As far as cost, since it's made out
of ripped 2*4's, painted with leftover Benny Moore, I have more money in
scotch consumed than building materials. It's also way cool looking.

   It's fabulous as a sun room, on an cloudy/overcast day it's 15F
warmer inside during the day (no sunny days yet). But I wonder what I
can do to protect those plants (without added external heat).

   There's maybe a 1000 lbs or so of brick in the floor (in contact with
the ground). I have more brick available.

   So are these plants more sensitive to cold on the roots (they are
potted) or the leaves?

   Suggestions to improve?

   Jeff






































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