While I haven't yet placed an order....Brent's comments "What they should say about knitted shadecloth is that won't unravel VERY FAR." are well taken and I'm planning to follow his advice and purchase woven. Several of the sites advertise that they will add a taped edge with brass grommets to the cloth for a price and they also sell plastic grommets. These were four of the sites I found googling 'shade cloth.'
Also thanks for the link to Dyna-Gro. While visiting the Nat'l Arboretum I asked what they fed the trees and while they use various mixes, Dyna-Gro was the only fertilizers they mentioned by name. I haven't found it locally (within 50 miles) but I did notice that they sell it off the Dyna-Gro site.
http://www.shadecloth.biz/
http://www.catalogclearance.com/depts/shadecloth.html
http://www.harpstarps.com/shadecloth.htm#
http://www.thenaturalhome.com/shadecloth.htm
Thanks again for the advice. I need to do start out protecting these trees from the start...having seen how the July/August sun cooked the amur leaves last summer to brown cripsy edges.
Thanks again for the help!
Randi