It will be the drip zone you need to look at. Go by how wide the canopy
is. And keep in mine that it could get wider. If you aren't sure come up
with method that lets water through instead of blocking it - pavers with
a decent amount of space between them perhaps.

Hey, you didn't know such a simple question could start a flame war did
you?

cheers

jules

Henry VIII wrote:
We have just moved to a new home that has two fifty-foot eucalyptus trees in
the back yard about 20 feet from the house. The area where the trees are is
plain dirt that has never been planted/irrigated. The tree roots do not
appear above ground.

We'd like to pour concrete in the back yard area to make a patio. Any
suggestions on what to do or not do when laying out the concrete forms such
as minimum distance to the trunks?

The trees have been here a long time and we don't want to do anything that
will injure them. This is in Los Angeles.

Thanks.