IS BLACK FELT ROOFING PAPER HARMFUL TO PLANTS?

I AM BUILDING A STACKABLE BLOCK RETAINING WALL ABOUT 2 1/2 TO 2 FEET HIGH. MY QUESTION IS: CAN I USE A ROLL OF SOME LEFT-OVER BLACK FELT ROOFING PAPER TO LINE THE INSIDE OF MY WALL, AS A BARRIER LINER TO KEEP THE WATER AND SOIL FROM SLIPPING THROUGH? OR, WILL THIS MATERIAL HURT THE FLOWERS AND PLANTS, THAT I PLANT IN THIS PLANTER?

Submitted by PRIETOPST1

Hi, I don't think it will be a problem. I might not grow vegetables with this product, but if you are using it around landscape shrubs, i think you'll be fine.

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I have been using tar paper for several years in my flower beds. It heavier than the usual paper the is sold for the same purpose. It has not caused a problem it does help keep the weeds and grass out. I have not used it in the garden but i will be trying it. It does deteriate after time. the shingles seem to hold more heat in the flower beds requiring more water, so I discontinued using them.
Submitted by jacquelinknigh2