Won't these things just kill everything in their dripline anyway? I don't think the grass will matter.
Otherwise, learn all you can and you can come plant my tree when I get around to buying one.
Maybe I can hijack this a bit - I lost a tree and it took out a major portion of the main rootball. If I plant another will I have to do it somewhere else or can I plant it in essentially the same place?
| 
