North American Fruit Explorers mailing list at ibiblio

[Rondi <nafex@mokalive.com>]

A couple years back I had good results bunching peach trees together 
and covering them with saw dust.. I'm in zone 6 as well.

Rondi

> Subject: Re: [NAFEX] Protect potted apples trees from freezing?
>
>  An alternative to a protected building is to dig the pots into the 
> ground.
Whatever you can do, or dream you can, begin it.
Boldness has genius, power and magic.

Goethe