Meganium is a sauropod-like Pokémon. Instead of having a leaf coming out of its head, like its two previous forms, Chikorita and Bayleef, it has two stamen-like protrusions sprouting from the top of its nose, each tipped with its own anther. Also unlike its previous evolutions, its irises are yellow instead of red, and its four feet have three toes instead of a single one. The leaves around its neck seem to have sprouted into a large pink flower, with a yellow central pattern and white tips. Meganium has also reverted to the color it was as a Chikorita, whilst Bayleef's main body color had become a beige-yellow coloration.
A female Meganium has shorter antennae.
The aroma emanating from Meganium's petals soothes anyone that comes in contact with it. It calms aggressive feelings. In battle, Meganium uses this scent to calm its opponent and remove any desire for it to fight, giving it the upper hand. Meganium's breath has the power to revive dead grass and plants.