From the Super Mario Wiki, the Mario encyclopedia
The Shriveled Seed is an item in Paper Mario: The Origami King. It is located in Whispering Woods, and is found in a golden ball hanging from a tree with a vine hanging from it. Pulling on the vine causes it to break, and the Shriveled Seed can be obtained by using the 1,000-Fold Arms. The Shriveled Seed must be thrown into the spring in Whispering Woods, causing it to be restored as the Soul Seed, which must be given to Ol' Grandsappy in order to progress.