With all respect due the subject.... I heard on radio that at the memorial at ground zero they are going to use sweetgums and oaks surrounding the reflection pools. Now, they are great trees and all, but did they consider the mess? In spring you get the oak flowers that dry and turn to brown stringy tumbleweeds. Then in fall not only the leaves, but acorns and those sweetgum sticky balls (seed pods) all winter. Now, if they plant asexual varieites of some kind or use deflowering agent injections or sprays it may be another story and not even an issue. All that mess though falling into the water, on the sidewalks. Does that sound wise? Does anyone know more about the plan? I'm not making a judgement. I don't have all the info about the plan- just throwing the thought out there and seeing where it lands- anyone know anything more about the plan at ground zero-particularly the trees/landscaping? I'll google it after this post.