Sun-shroom

gives small at first and gives normal sun later.

PvZ The Fall of The World
It functions exactly the same as it in the original game.

Almanac: He was looked down by everyone because of its small size. (Literally, he was looked DOWN.)

Plants Vs. Zombies: The Next Levels
It has not changed from PvZ2. Almanac: Sun-shroom keeps bragging on about how she's the best sun-producing plant, and that she started off small and grew on to become a legend. The sun producers just groan, and wonder what she'd be like if she was always small.