Polly Hill Arboretum will host the second in its series of 20 Iconic Trees tours, celebrating its 20th year as a public garden. The series began on June 7, with five trees featured, and on Thursday June 21 five more trees will take center stage. Subsequent dates are July 12 and July 26. All tours in the series begin at 5:30 p.m.

The arboretum is located at 809 State Road in West Tisbury.