Analysis of information sources in references of the Wikipedia article "Old Forest" in English language version.
After finding Tom in Chapter 9: Lilies for the River-daughter, he agrees to help you—only if you collect lilies for his wife Goldberry. Tom warns you that the lilies are guarded by the ancient tree known as Old Man Willow. Some say that this venerable tree and its dark heart is the source of all that is evil within the Old Forest.