Is that true ? Someone told me they were. Just wanted to confirm that

All orange mossms that you see are offspring, they were here only for a while. So it's important to keep on breeding them :)

isn't that true for all colors though ?

So, about a year and a half ago we introduced orange during a special event. It was available as a planet trait for only a few days. Unlike other colors that originate from starter kits, the loyalty program reward or Splurt reward, you can't get orange from us.

The only way to get orange, if you do not already have it, is to get it from another player.