Cutting through buried landscape fabric
Previous owner of my house covered much of the back yard with long sheets of landscape fabric, then covered with mulch and soil. Over the years, a thick weed eco-system has developed on top of the fabric. I need to remove the landscape fabric, but have to find a way to cut it into pieces. It is embedded in the ground and is not budging when I pull.
I'm trying to come up with a cutting tool, preferably on a long handle, to do this job. It has to be sturdy enough to plunge through 3-4 inches of soil and roots and still be sharp enough to cut the fabric. And being able to attach it to a pole would save my back.
I've come up with and rejected ideas such as a box cutter or an Exacto knife - both sharp enough but the blades are too short. I'm wondering whether some sort of knife used by fishermen would work. Anybody have any ideas?