Spiny Piranha Plant
From the Super Mario Wiki
The Spiny Piranha Plant is a purple variant of Big Piranha Plant first appearing in the game Super Mario Galaxy. They are bigger, purple Piranha Plants whose stems are covered in spikes. To attack, a Spiny Piranha Plant attempts to slam its head into Mario or Luigi. It can be defeated by hitting it with rubbery bulbs, by stomping it after it has slammed its head on the ground, or shooting it with a fireball as Fire Mario. Some are necessary to be defeated in order to make a Sproutle Vine grow so Mario (or Luigi) can proceed. Shooting one with a Star Bit makes the Spiny Piranha Plant act immediately.
In Super Mario Galaxy 2, the Spiny Piranha Plant reappears with the same behavior. The game also introduces a new variation called the Prickly Piranha Plant, which attacks in a similar way, but is black and cannot be stomped due the spikes on its head. Spiny Piranha Plants appear in Sky Station Galaxy, Rightside Down Galaxy, and Throwback Galaxy.
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