What is tannin root?
It doesn't do anything because it doesn't really exist.
Tennis is a substance found in many plants, but not in plants themselves.
The leaves of the Thames were used in the first film version of Amy, which probably inspired Leon to use the root in his book.
Tennis / Tennis has no root ... and according to this person's answer ... Tennis is a substance that is abundant in plants, but not in plants themselves. ... What you mean is tannin ..., then completely different.
That's not true ... This is a fictitious plant used in baby rosemary
What they call it is like an herbal supplement.