Roy Herold
Mon, 08 Nov 2010 14:33:46 PST
I beg to differ regarding the use of impermeable plastic for covering 
plants in the winter in Massachusetts. It *does* work.

Most of the big commercial nurseries around here that grow potted plants 
cover their outdoor stock with Microfoam. This is a closed cell 
polypropylene foam that is around 1/8" thick. Typically it is put over 
pots or beds after a hard freeze, and removed in March. An additional 
covering of white plastic film may be used. Note that everything is 
white to reflect sun, and minimize freeze-thaw cycles.

I know home gardeners who have successfully used it, too.

I agree that it would be foolish to use plastic in warmer weather, but 
that's not what we're talking about.

Reflectix might work so long as it does not become brittle in cold 
weather. Microfoam might be more practical and cheaper, however, if you 
can use a 270 foot long roll. And styrofoam would also work if used 
properly, as Adam observes.

Most nurseries stopped using hay a long, long time ago.

NW of Boston

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