Scott Jamieson examines up close a Swamp White Oak, which he helped plant this spring in front of Our Lady of the Wayside School in Arlington Heights. Jamieson assisted in planting Swamp White Oaks at ground zero this year.

Bob Chwedyk | Staff Photographer

Bartlett Tree Experts cared for oak trees before they were planted at Ground Zero in manhattan.

Courtesy of Bartlett Tree Experts

About 400 trees will be part f the monument in New York.

Courtesy of Bartlett Tree Experts

The trees at Ground Zero in Manhattan grew five years before being planted.

Courtesy of Bartlett Tree Experts

Scott Jamieson examines up close a Swamp White Oak, which he helped plant this spring in front of Our Lady of the Wayside School in Arlington Heights. Jamieson assisted in planting Swamp White Oaks at ground zero this year.

Bob Chwedyk | Staff Photographer

The tree in the middle is the "Survivor Tree" that was pulled from the rubble of the World Trade Center, and Bartlett Tree Experts nursed it back to health.

Courtesy of Bartlett Tree Experts

When Bartlett Tree Experts cared for the trees for the 9/11 site in Manhattan, they grew to a large size.

Courtesy of Bartlett Tree Experts

A stone commemorating 9/11 is at the base of a Chinkapin Oak planted by Scott Jamieson in front of Our Lady of the Wayside School.

Bob Chwedyk | Staff Photographer

The oak trees soften the appearance of the 9/11 monument in Manhattan.

Courtesy of Bartlett Tree Experts

Scott Jamieson talks about the two trees he planted in front of Our Lady of the Wayside School commemorating 9/11.

Bob Chwedyk | Staff Photographer

The National September 11 Memorial Museum is seen at ground zero in New York, Wednesday, July 20, 2011.

ASSOCIATED PRESS

Arborist Jeremy DeSimone, left, sprays fertilizer on a swamp white oak at the National September 11 Memorial, Friday, May 13, 2011 at the World Trade Center site in New York. The memorial will be open to visitors after the tenth anniversary on Sept. 11, 2011.

ASSOCIATED PRESS

President Barack Obama pauses after laying a wreath at the National Sept. 11 Memorial at Ground Zero in New York, Thursday, May 5, 2011.

ASSOCIATED PRESS

Scott Jamieson and others from Bartlett Tree Experts grew trees above ground for the 9/11 monument in Manhattan.

Courtesy of Bartlett Tree Experts