From SmashWiki, the Super Smash Bros. wiki
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It manifests as a tuft of grass which randomly appears on the ground. The character who plucks the grass receives a random item - with some exceptions such as Freezies and Pitfalls - and briefly holds it above their head before wielding it (if it can be wielded) or automatically using it (if it is a status or recovery item). Grass vanishes if the platform it is on disappears.
Tufts of grass appear in Super Mario Bros. 2, which when plucked produce an item, most commonly a vegetable but sometimes a Magic Potion, a POW Block, a bomb, or a Turtle Shell. In Subspace, plucking grass rewards the player with coins that can be spent at the end-of-level slot machine.
Players can also pull up Stop Watches (in place of every fifth ripe vegetable), Rockets, and in the GBA remake, hearts, all of which activate immediately: this may have inspired the instant effect-granting properties of any plucked status or recovery items in Super Smash Bros. 4.
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