I start seeds inside in early Jan. I don't know if they will bloom by March though. You may have to over winter some to do that?
I also WS some but they will bloom later. I do know that they do not like to be crowded in their pots and need to be transplanted so they don't get root bound. Best bet is probably to get some going however you can and plan on them reseeding. I have a few in hanging baskets I bring into the greenhouse to overwinter as well. I have one in a hanging basket right outside my front door, in an alcove, that is thriving. Maybe it will blossom in March. I'll have to keep track this year.
