Oh you mean a discretized, and spreadable idea, that propagate through populations? Yeah lost have lost the plot and think it just means like reaction gifs or wojaks.
Wouldn't that be because of the season? You're not supposed to see flowers all year round. Also plants don't cover everything evenly, you will have patches
In English, it specifically references the terrain of the Mississippi basin.
In French it's a more general term. English borrowed the term specifically because the French had claimed the area occasionally known as the American Prairie as their territory.