This micro expansion can be found in Promo Pack III.
The Plant Micro Expansion gives each player even more control over the food supply. Players grow their own Plant Species, cultivating them to collect increasing amounts of food tokens while feeding off of the Plants of other player.
BIG NEWS: we've turned the original Evolution into a video game for iOS, Android, and Steam. It's got lots of new content and modes of play, and a refined interface. The learn-as-you-play tutorial makes it perhaps the easiest way to learn Evolution.