Arlington County Invasive Plant program needs volunteers to remove invasive plants: 9-11 a.m. first Saturdays, Haley Park; 10 a.m.-noon second Saturdays, Lacey Woods; 2-4:30 p.m. second Sundays, Gulf Branch Nature Center; 10 a.m.-noon third Saturdays, Tuckahoe Park; 2-4 p.m. third Saturdays, Madison Manor; 2-5 p.m. third Sundays, Long Branch Nature Center; 10 a.m.-noon fourth Saturdays, Benjamin Banneker Park; 10 a.m.-noon fourth Sundays, Fort Bennett Park.