From SmashWiki, the Super Smash Bros. wiki
Retrieved from "https://www.ssbwiki.com/index.php?title=Grass_(item)&oldid=1098350"
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.
Grass reappears as an item in Ultimate with the same properties as Smash 4.
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 Subcon, 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.
Ads keep SmashWiki independent and free :)