perennial

One would have supposed from the appearance of the country at the end of the first season after the eruption that practically all plants except the trees and bushes had been destroyed, and that revegetation must be due to new seedlings started on the ash. Such, however, is not the case. Excavation of the root systems of the new plants shows that they are old perennials which have come through the ash from the old soil.

Some of the stars on our list are perennials who fill huge venues year after year after year, but there's also a returning superstar on our list of the hottest summer tours of 2019.