Tree sticks through terrain despite collider being same height

So my tree is sticking through the terrain despite the mesh being the same height as the tree from top to bottom I've tried using a capsule collider (currently using a box collider) but both don't work Here's the issue : ![alt text][1] The collider ![alt text][2] anyone know what the issue is? [1]: https://i.gyazo.com/c47b19fa2f7e909709f3795ed39e02b7.png [2]: https://i.gyazo.com/b83df8dc26d3498c74857028f88a4394.png