If you dig down about 2 foot (or several inches lower than the lowest root you find) and install a rubber barrier that goes from the bottom of the trench to up above the soil, it wont be able to spread to you anymore :)
You could use brick, stone, or cement, but if any cracks exist or form it’ll eventually find the way through, where that’s significantly less likely with a solid sheet of rubber.
If you dig down about 2 foot (or several inches lower than the lowest root you find) and install a rubber barrier that goes from the bottom of the trench to up above the soil, it wont be able to spread to you anymore :)
You could use brick, stone, or cement, but if any cracks exist or form it’ll eventually find the way through, where that’s significantly less likely with a solid sheet of rubber.