Eufloria

It is set in a futuristic space environment, where the player assumes the role of the commander of interstellar lifeforms called Euflorians, who live and gain their resources on asteroids. The player has to use basic units that are grown on Dyson trees and are called "seedlings", to colonize and conquer asteroids. On asteroids, Dyson trees may be planted and as the tree grows and gets stronger, it will produce more seedlings with certain attributes. (wikipedia.org).