The temperature on the planet of Stargate was relatively stable due to the protective shield above the atmosphere and the air flow throughout the planet. As a result, the distinct seasons of spring, summer, autumn and winter were not that evident here.
The plants, be it the wild grass, reeds or trees, were growing freely.
This was a new civilization emerging from the ruins of the distant ancient civilization, but it didn't have enough time to form its own distinctive order yet.
The variety of the animals and plants in this world was limited and seemingly monotonous, probably for this very reason.
The fact that the leaves of the gingko trees turned yellow had nothing to do with the change of the season; it was because rainfall occurred more often during this season.
