Doug Tallamy's book entitled "Bringing Nature Home" stresses how important native plants are to insects and birds. A recent article appeared in the Home and Garden section of the New York Times entitled To Feed the Birds, First feed the Bugs. It is an excellent article about the ecological effects of invasive plants. This article really points out the need to landscape with native plants.
To read the full article go to: http://www.nytimes.com/2008/03/06/garden/06garden.html?_r=1&ex=1205557200&en=a7da38291ef31e42&ei=5070&emc=eta1&oref=slogin