"Bouncing bulbs losing height?"
— Tilden Toots of Toots, "Shoots 'n' Roots" (JKR)
The bouncing bulb is the very active, moving root of a magical plant. Repotted during Herbology class; one wriggled free from Harry’s grasp and banged him in the face (GF18). Mentioned in the Rumours advert for the Toots, Shoots ‘n’ Roots radio program (JKR).