User blog comment:ShroomstagramUser/SSU's sandbox of wonderfulness/@comment-24203813-20151128035521/@comment-1764483-20151201104621

I've also seen people (particularly Ballistic Planet) tie limited-time plants with worlds. For all of these plants you mentioned, their categorization most likely stems from their almanac/seed chooser order.

Also, Cavia, aren't you the one who gave me that Starfruit argument I mentioned? Granted, the evidence is less strong than post-FF world premiums, but still.