Single Moving Tree Collider

Unity Engine
1

I once came upon an idea on the forums for tree colliders. Why not use 1 single collider for trees. This Collider would move to the nearest tree from the player’s position. So I scripted something together and got some result.
My Collider moves to the nearest tree, once. When I start the game, the collider is on the nearest tree, but it doesn’t update, so I guess I have a logic mistake somewhere in my script. If someone could look over it and tell me where I made a mistake. I use LateUpdate() to make sure the character has made his move, but even in Update() it’s not working. Thanks for the help. I also would be happy for optimization. I’m not the greatest scripter, I try though.

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class TreeCollider : MonoBehaviour
{   
    TreeInstance[] trees;
    TreeInstance tree;
    Vector3 treePos;
    Vector3 pos;

    // Terrain Size
    Vector3 ts;
    //Terrain Position
    Vector3 tp;
    //How far is the nearest tree
    float proximity;
    float nearestTree = 10000f;
    //Player Position
    Vector3 player;

    int nearest;
    //moveable Collider
    GameObject treeCollider;

    private void Start()
    {
        //Find all trees on terrain
        trees = Terrain.activeTerrain.terrainData.treeInstances;
        //assign terrain size
        ts = Terrain.activeTerrain.terrainData.size;
        //assign terrain position
        tp = Terrain.activeTerrain.transform.position;
        //find the player position
        player = GameObject.FindGameObjectWithTag("Player").transform.position;
        //find the collider in the Hierarchy
        treeCollider = GameObject.Find("TreeCollider");
    }

    private void LateUpdate()
    {
        //go through every tree on terrain and check how far it is from player
        for (int i = 0; i < trees.Length; i++)
        {
            tree = trees[i];
            treePos = tree.position;
            //find the world coordinates
            pos = (Vector3.Scale(ts, treePos) + tp);

            proximity = (player - pos).sqrMagnitude;

            if (proximity < nearestTree)
            {
                nearestTree = proximity;
                nearest = i;
            }
        }
        //assign nearest tree
        tree = trees[nearest];
        treePos = tree.position;
        pos = (Vector3.Scale(ts, treePos) + tp);
        //move the collider to the nearest tree position
        treeCollider.transform.position = pos;
    }
}
2

Could someone please test this and tell me what I did wrong?