Rainbow Flowers are a kind of plant native to Ariel, a moon of Uranus. ("The Secret of the Space Souvenirs")

They also grow on Pluto. Since they come from an icy world, they aren't harmed by trips through space. ("The Bride of Bizarro")


Bizarro went to Pluto to get Rainbow Flowers for Lois. However, the seeds were destructive in Earth's atmosphere and destroyed Lois' apartment. ("The Bride of Bizarro")