North American Fruit Explorers mailing list at ibiblio

[Sarah Kehler Ewing <skkewing@yahoo.com>]

The local experts up here: zone 3 near Edmonton, Alberta, recommend an 
expensive short clumping type of grass called "Orchard Grass" at our local 
bulk seed dealer.  Clumping grass doesn't choke out the trees with hard 
competition and actually having grass under the trees increases the hardiness 
of the trees as they die out much more easily with dirt under them when we 
have one of our snow-free and -40 degree winters.