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Oddish resembles a plant bulb with round, foot-like roots. It has a blue body and beady red eyes. Five large, green leaves sprout from its head. As demonstrated in the anime, these leaves are prehensile: Oddish can use them to scale vertical surfaces and catch light objects.
Oddish lives in grasslands and forests. It roams extensively at night, sowing seeds and searching for a fertile, nutrient-rich patch of soil in which to plant itself. It remains planted throughout the daytime, leaving only its leaves exposed to the sun in order to avoid predators. If removed from the ground, it will let loose a loud scream. While Oddish absorbs most of its nutrients from the soil during the day, it can also grow by absorbing moonlight.