From the Super Mario Wiki, the Mario encyclopedia
A Venus Guytrap is a plant in Wario Land: Shake It! which closes around Wario after a set time. Their name is a variation of the plant Venus Flytrap, although they function more like Piranha Plants. Yellow-and-red Venus Guytraps take longer than red-and-pink ones to close. Wario needs to shake to get out. If Wario jumps on a Venus Guytrap and then immediately jumps again, he can be on top of it, allowing him to reach high places.
One of the treasure chests that Wario finds contains a Venus Guytrap seed.
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