A giant 30+ feet pine tree is growing wildly one foot outside my fence.
All the tree root are growing underneath inside my garden.

The tree root and stubs are all over the surface of my garden.
All my grass and plants die.

I want the root stop growing into my garden. Better yet, I wish this tree
stops growing.

I drilled holes in the root and poured some of the stubs removal pellets
(brought from Home Depot). Its difficult to drill much a one inch hole. So
far, nothing happened and root still growing like crazy.

Any suggestions and recommendations are welcome?