Will Tannins Harm Plants?

EDIT: Tannin acid is a naturally occurring plant protein that makes your water slightly acidic. It lowers the PH of your water, which MAY be detrimental to some plant growth. However, it will not directly be the cause of plant death or growth stunts.

Are tannins good for plants?

Tannins are found commonly in the bark of trees, wood, leaves, buds, stems, fruits, seeds, roots, and plant galls. In all of these plant structures, tannins help to protect the individual plant species. Tannins that become stored in the bark of trees protect the tree from being infected by bacteria or fungi.

Are tannins bad for soil?

Results to date show the rate and amount of binding to soil varied from one tannin to another. The scientists found that the binding quality of tannins also can be used to immobilize metals such as aluminum, lessening the metals' toxic effects on root growth.