From the Super Mario Wiki, the Mario encyclopedia
The Healing Sprout is an item in Super Smash Bros. Ultimate. It is a small orb that can be picked up and heals 2% of the user's damage every set amount of time, with the orb disappearing after a couple of seconds of use. The orbs can be transferred to other fighters via contact, such as throwing the orb at another fighter, giving the benefits of the item to that fighter. When a Healing Sprout is given to a fighter this way, the item is attached to a part of their body instead of being held, thus allowing multiple Healing Sprouts to be used by a fighter at the same time.
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