Lettuce 'Artic King' This large butterhead lettuce is light green, crunchy and exceptionally hardy.

Nevertheless, the tree has proved exceptionally hardy.

Many species are exceptionally hardy and some are considered weeds in gardening; a few are invasive weeds of significance.

Exceptionally hardy but needing shade..

Three weeks later, the exceptionally hardy will close the Triple Crown series with the Belmont Stakes in New York.

'Lavender Twist' has proved exceptionally hardy.

In 1968, however, Ray Bracken discovered a 20-foot-tall, exceptionally hardy form of a southern magnolia (M. grandiflora) growing in his South Carolina nursery.

He did grant that "its flashes of imaginative animation might be enough to tempt exceptionally hardy festgoers."

The tree is exceptionally hardy (down to at least -45 C), has a relatively short vegetation period compared to other walnuts, grows rapidly and is cultivated as an ornamental in colder temperate regions all over the Northern Hemisphere.

Best of all, this is a low-growing species, and it is exceptionally hardy with good drought tolerance.