After continuing researching the absolute best fabric is rated for 9 months and still retain 80% strength. I found a company with surplus 81 inch tempered glass, wondering about painting a reflective paint on the back side and using that?Is the fabric UV resistant?
I previously used grey non-woven under bark. On a slope, wind and what not moves the bark and exposed fabric shreds after sun exposure.
I recently bought black woven "20 year sunlight resistant", the stuff you see as construction fences and the like.
It it weakening and shredding in a couple years. I think it is 20 year if covered and somewhat sunlight resistant.
I was suspicious about polypropylene, UV coated. Polypropylene is the stuff of blue tarps, and not sunlight resistant.
There are plastics which will last a couple decades in the sun. But I haven't found landscape fabric that will.
Get goats?