you are so lucky... this is tampa vervain, mine bloomed all last winter, the two nights in a row of 16F burned 2-3 leaves off one plant. pretty sure about this id, i have blonde eyes. just floridafriendlyplants.com
is definitely a light purple (color challenged), not pink, i bought mine at home depot, came from floridafriendlyplants... they do reseed and they also spread when kept kind of wet. i scattered dried flower pods and they definitely came up, can't really explain the seeds to you, but sure you will find them fine. it was wonderful to have them blooming all winter.