From the Super Mario Wiki
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The Bubble Shrub is a flower found in Donkey Kong Jungle Beat. When Donkey Kong jumps into one, Donkey Kong will come out inside a bubble and will be able to float in the air slowly until he claps or touches an enemy or a wall.
The Bubble Shrub helps Donkey Kong go up to higher areas he couldn't reach before. The Bubble Shrub also shoots bubbles up in the air (which are useless), even when Donkey Kong doesn't jump in the flower.