Tradescantia is a genus better known as house plants here than garden plants. A few species of the genus were very popular houseplants when I was growing up, f.ex. T. zebrina, T. spathacea and T. pallida. Tradescantia x andersoniana is a garden hybrid between T. virginiana and other species. I grew this plant from seed many years ago, probably in 2007 or 2008 and it seemed fairly hardy, but very sparse on the flowers, so I ended up pulling it out. Maybe I should have been a little more patient with it. It needs plenty of sun and grow best in humus-rich, well drained, fairly moist soil. It started flowering around mid-August, which I felt was too late, since at that time a hard frost had usually hit by mid-September. Times have changed in that regard.