"A lot of fertilizer and miracle-grow did nothing for this guy. Watch its eye - you may get Diamondized."
— Description

Trillionage Sprout is the guardian of the third "Your Sanctuary" location in EarthBound, Milky Well. The Trillionage Sprout is aided in battle by two Tough Mobile Sprouts, which can heal the Trillionage Sprout with LifeUp. This boss is the first enemy encountered by Ness and co. that can Diamondize party members, and is one of the very few enemies who can do so.


Its name is a contraction of the phrase 'Trillion age', in reference to its appearance: a withered sprout that has evidently survived for a relatively long span of time without maturing.