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Re: cold frame vs. row tunnels

Square Foot Gardening List - http://www.flinet.com/~gallus/sqft.html

I don't know if he covers it in his 4 Season Harvest but Eliot did say 
on one of his Gardening Naturally programmes that each layer give 
1 to 1-1/2 zones of protection.  So a cold frame changes a 5 to a 
six or 7, a cold frame changes 5 to 7 or 8.  Is that enough?

One advantage of a greenhouse structure is that you can get into it 
yourself, getting the gardener as well as the garden out of the 
elements.  

The size of your bed shouldn't matter since you would want your 
greenhouse to be at least 2 feet wider than your beds on all sides 
(you don't walk on your beds, right?).  So it doesn't matter if it is 2 
ft on one side and 2.5 on the other.

So if you really want to do a second layer and harvest spinach etc 
all winter, I would have a greenhouse/hoop house as the second 
layer.

Lorraine Young	
Zone 6
Southern Ont.

On 6 Sep 99, Sammy's huwummun wrote:
> I've read relevant portions of Mel's book &
> Coleman's "4-Season Harvest." ... I want to grow crops all winter (for the 1st time),
>...Down to how cold could I expect protection?   
> 
> Ok, supposing that it doesn't give cold enuf protection -- here's my
> idea:  Do a second slightly larger tunnel over the first tunnel & use
> the air between the 2 as insulation.  How much would this help?
> 
> I think the tunnels would be made out of bent PVC pipe.
> 
> Why don't I just buy something.  Several reasons:  
> 1.  my bed is a nonstandard size


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