Pine Shavings Around Tomato Plants . Avoid using pine wood shavings to mulch plants that require low soil acidity because pine causes a marked increase in acid levels. The bales i get are 3 cubic feet and expand to. Windmill Farm from windmillfarmofgridley.blogspot.com I hope the shavings wont have all the unknown stuff. These things occur in nature, but can be concentrated and. I bought the pinewood shavings from a petshop.