T4.1 Root Collar, Stem Diameter or Girth

general - root collar diameter - cell grown trees - seedlings, cuttings and transplants - stem diameter - girth

These dimensions are given in specifications of trees since they assist in quantifying the ‘substance’ of the plant. Through some cultural methods, trees can gain in height but without thickening and developing the preferred characteristics of a well grown tree. For this reason standard measures of diameter or circumference of the main stem of trees have been developed so that these can be added to plant specifications where appropriate.