Posted: 13/03/2014 at 13:43
Depends on which sort you have....I have hardy perennials that grow and flower every year.
There are several new varieties that are sold and grown as annuals, viz., tender. However, I find these can flower the following year too. I take cuttings though.......mid summer to autumn...and they become "perennial" that way.
Do you know the varieties you have? Or description of them to help identidy them? The hardy varieties can be propagated now......