The biggest expense with a coldframe or hotbed is an automatic opener
if you're not around to open and close it for ventilation as needed.
(and you have to do that with a greenhouse, too.)
Kay



... not a really huge expense - $ 50. or so.
.... you might need two ( ? ) depending on the size
of your mini-greenhouse and air flow.
http://www.leevalley.com/en/garden/p...,43224&p=10543
John T.




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