"F Paul" wrote in message
m...
I am planning to renew my weedy, troubled lawn by killing the grass
with Round Up Weed and grass Killer, and reseeding. I know that I have
to protect any flowers that are near where I plan to spray. But there
is a tree -- and old 100-foot robust tree with extensive roots --
right in the middle of the lawn. Question: will the weed killer affect
the tree and its root system? If so what can i do to still knock out
the grass, and not harm the tree?

Thanks.

When we built our new home, the back yard was nothing but waist-high weeds
and lots of trees. I used Roundup and killed all the weeds, but didn't hurt
any trees. I wouldn't spray directly on the trees, but it won't leach into
the soil and get to the roots.