From the Super Mario Wiki
These plants are only grown and found in Lavalava Island. Mario encounters these kind of plants after the five Baby Yoshis attempt to play Hide 'n' Seek into the deep jungle during the events of Chapter 5. When Mario attempts to examine or whack one of them with his Hammer, the plant will blow out star dust. The plant will sometimes shoot out some Coins, but other than that, they mainly serve as scenery in the area.
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