From the Super Mario Wiki
Shaking any of the bushes in Koopa Village will make a leaf pop out. After leaving the area and coming back, a new leaf will be in the bushes. They are good for making Life Shrooms from Super Shrooms or Volt Shrooms.
One of Koopa Koot's errands involve bringing him a cup of Koopa Tea, which can only be made with this leaf.
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