Shop › Japanese Knot Weed Extract Japanese Knot Weed Extract $30.00 Japanese Knot Weed in 100 % organic grain Alcohol & water. Size: 2oz $30.00 4oz $50.00 Quantity: Add To Cart Added! Japanese Knot Weed in 100 % organic grain Alcohol & water. Reviews Reviewer Name Review Date Star Rating Description Posted on Etsy Product Show More