Why is Greenland called so though it has no vegetation?

The name Greenland comes from Scandinavian settlers. In the Norse sagas, it is said that Erik the Red was exiled from Iceland for murder. He set out in ships to find land rumoured to be to the northwest. After settling there, he named the land Grfnland (Greenland), possibly to attract more people to settle there. Greenland was also called Gruntland (Ground-land) on early maps. Whether Green is an erroneous transcription of Grunt (ground), which refers to shallow bays, or vice-versa, is not known. The southern portion (not covered by glacier) is very green in summer.

— Adishree Pandita, Delhi