Not sure I get the "stewardship versus economizing"...
This is all about stewardship, and agreeing on what that means, no?
Other topics to add to the "should we" list is:
- Should we consider that our world in 2009 is very different than it was in 1868?
Meaning, Morton Arboretum's experience/research, and the nursery industry(tree choices and availability) was not anything like it is today.
- Should we then consider what was behind Olmsted's choice of "only natives in Riverside", since he was not "above" using exotics in some of his other projects?
There is a lengthy list of why natives are a good idea, but I believe if you boil it down, the basis Olmsted chose natives was simply that they were hardy and would not require substantial upkeep.
Maybe I have a simplistic view, but here is an excerpt from the UMich Revisting Riverside paper
The prairie landscape architects interest in the use of native
plants in their arrangements grew from an increased understanding that native plants tended to fare better in the Midwestern landscape than some exotic species
-Should we then learn/ask why the Accolade Elm was developed?
As early as 1950, the dreaded DED was discovered in Illinois and by 1959 had been found in every county in Illinois. By the late 1950s, nearly 80% of the original elm population in central and southern Illinois had been killed due to the ravages of this fungal pathogen. Due to the removal of dead or dying elms from the urban forests and landscapes, communities throughout Illinois and the United States experienced the loss of cathedral-like tree-lined boulevards, greatly reducing landscape and property value, shade, and other ecological benefits.
As a result of this catastrophic event, a concerted and cooperative effort was begun by tree breeders and geneticists to develop and\or discover new elm species and\or hybrids that would be resistant to Dutch elm disease.
Hopefully, results from these studies and the elm improvement study will once again establish the elm to a useful place in our urban forests and landscapes without the need for intensive pest control practices.
Read NEW ELMS FOR THE LANDSCAPE AND URBAN FOREST for the rest of Professor of Horticulture Miller's paper.
IMO, you can't take things written in another time period as being "without reapproach"...you have to think about the what was the context in which it was written. Yes, we are going to introduce variance from different interpretations, but IF we can put aside personal emotion we should be able to get to some logic that we can all align with.