Abstract: A tree guy line system including a plurality of guy lines with each line having a first and second end and a limited extension spring assembly disposed between the ends to allow a limited extension of the lines to absorb large forces due to wind gusts, etc. A plurality of anchors are adapted to be inserted into the ground at spaced locations around the tree with the second end of each line being secured to a respective anchor. A line adjacent the first end thereof forming a collar for placement around the trunk or limb of a tree where the line extends from both ends of the collar. A tension bar has a line engaging end slidably mounted on the line below the collar and another end of the tension bar secured to the first end of the line so that the line engaging end can be moved along the line to remove slack and place the line in tension.