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But but but it's natural, 😢Walnut Sawdust is toxic! Walnut Burn!Walnut is Poisonous! Walnut is harmful to animals!Walnut can't be used a mulch!All of that we hear often and are true but not everyone knows why! Walnuts naturally produce a chemical called Juglone. It's in the wood fruits leaves roots and bark basically all parts of the tree! It is most heavily concentrated in the roots and fruits though! So what is Juglone??Juglone occurs naturally most plants in the Juglandaceae family especially the black walnut and is toxic or growth-stunting to many types of plants. It is sometimes used as an herbicide, as a dye for cloth and inks, and as a coloring agent for foods and cosmetics. It can cause a rash or reaction on people (especially loggers cutting live trees off near the ground where it is concentrated) Nature's way of giving a walnut tree a defense against other plants and a edge on being able to grow and thrive.