An apparatus for trimming the root system of a tree, said apparatus comprising - means for holding the stem of the tree, and - a cutting tool. To effectively trim the root system, the apparatus comprises as the means for holding the stem - a first section comprising a first driven transport belt provided with resilient material, - a second section comprising a second driven transport belt provided with facing the first driven transport belt; wherein the facing transport belts define a path for transporting the trees along the cutting tool.
