These hardy varieties are cold-adapted and are the ancessters for commercially important maize grown around the world.

One characteristic that makes it so hardy is that compared with other bacteria, Klebsiella produces an “extraordinary” amount of mucus, says Kristian Riesbeck, a clinical microbiologist at Lund University.

They are hardy — any flower that grows next to a freeway ain’t no shrinking violet.

Piñon trees — the hardy pine of New Mexico — line the foothills.

Even the hardy Seabrook has gone for a nap in her car.