Will Bioweed affect the soil PH? 17 July 2022 23:51 The Bioweed is PH neutral it will not affect your soils PH. Related articles How long after spraying can you replant in that area? Acid based herbicides vs. Bioweed What is the active ingredient in Bioweed? Selective and non-selective herbicide For Best Results Comments 0 comments Article is closed for comments.