In the Cell Stage, green plant matter and later on, Seaweed, are used as food for herbivores and omnivores. Carnivores will simply ignore them.
In the Creature Stage, flora like shrubs and small trees produces the fruits and can be picked up and eaten by omnivores or herbivores. There are sometimes pieces of rotting fruit. Rotting pieces of fruit appear to be inedible, but can be consumed. Tall tree has no purpose.
In the Tribal Stage, like in Creature stage, flora produces fruit (except tall trees) and an omnivorous or herbivorous tribe can pick fruit from floras. Other tribes often have fruit in their food piles.
In the Space Stage, however, flora are essential to stabilizing a planet's atmosphere. There are three different types of flora: shrubs, small trees, and tall trees. Every planet can have three of each if fully terraformed to a T-3. Each Terra score level requires one more of each of the three kinds of flora, plus two herbivores and a carnivore. Some empires will offer the player missions to retrieve a flora.
In Galactic Adventures, flora are used as decorative props in adventures. There are two types of flora, flora that are in the "Fixed Object" category, and flora that are procedurally generated by the game in the "Flora" section in the Terraforming menu. The way Flora are generated in the "Flora" Terraforming menu is very much like (or most likely the same) how they are generated in planets. Like T-3 planets, the Terraforming Menu only will support only three plants in the three categories. Flora as props do not need to be in the "Flora" Terraforming menu to be used as a prop. They can be interacted with goals, unlike other flora.
- The Flora Editor was intended to be included in Spore, but was ultimately cut, and made unplayable without the use of hacks.
- There is a known glitch in the Space Stage. When a plant is being deposited, it grows. If you aim the abduction beam towards the sky, and keep the plant in the air long enough, it gets bigger. When you set it down on the planet's surface, the plant will be much larger than the rest surrounding it.