From the Super Mario Wiki, the Mario encyclopedia
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The plant rests right beside a large pit full of bramble. He is a peculiar plant who constantly blows bubbles into the air. Unlike the other unique plants in Flower Fields, Bubble Plant does not have a face, and his name appears to also be the name of his species. Upon speaking with him, he tells Mario that if he is given a Bubble Berry, he will demonstrate his abilities which will explain his nomenclature.
After Mario finds the tree that grows Bubble Berries near where Lily lives and hands one over to Bubble Plant, he will blow an enormous bubble that can carry Mario and his allies across the bramble pit, allowing Mario to travel further west to the Sun Tower. After Lakilester joins Mario's party, Bubble Plant's services become obsolete.