Only the oleanders thrived.

Your oleander looks wonderful.

The fragrance of the oleander.

Okay, actually, it's, uh, it's an oleander.

Oleander's poisonous. I don't know why people grow it.

Now, there's only one species of nerium oleander, But that doesn't exactly narrow things down.

Nowhere. It has to be synthesized from the oleander plant, which is everywhere.