GABE HERNANDEZ/CALLER-TIMES Arborist Nevic Donnelly gets a closer look around the center bark of the Big Tree during a root collar excavation Friday at Goose Island State Park in Rockport. (Photo: ...

A root-collar excavation was performed on this red maple to discover that girdling roots have restricted its growth, drastically affecting the health of the plant. A root-collar excavation was ...

Join the Office of Sustainability Saturday, Oct. 14, from 9:30 a.m. to noon for Root Rake Out to improve tree mulching on the quad through a process known as root collar excavation. Sustainability ...

Ryan Pankau demonstrates planting a tree wrapped in burlap. Ryan Pankau demonstrates planting a tree wrapped in burlap. DANVILLE- The root collar of a tree is an area at the base of the trunk where ...