I have had this one Spiderwort plant for several years. Can't really remember what year I planted it. It stays in a clump and has never spread or produced babies that I can tell. It is in full sun. This bed has landscape fabric down under the mulch.
Taken Sept 2014
Taken June 2015
Taken July 28, 2016 The spiderwort is on the inside corner of both of these photos. Guess I didn't get one of just the Spiderwort.