When your plants are done flowering, do not deadhead them. If they were pollinated then they will form seed heads. Leave them be until the seed heads dry out and then later burst open. If your winter is cold enough for the seeds to germinate (at N. Alabama I am guessing it is), then they should sprout come spring. Be careful though when weeding, they look very much like grass seedlings, just a little more fleshy! (Best advice I can give for that is to pull everything you know for sure is a weed, then go back and compare what is left to identify your new seedlings vs grass.) Your new seedlings will not flower in the 1st year; if they follow the same growth rules as many other plants grown from seed, I would expect the vigorous growers to flower possibly in the 2nd year and the rest in the 3rd.
When your plants are done flowering, do not deadhead them. If they were pollinated then they will form seed heads. Leave them be until the seed heads dry out and then later burst open. If your winter is cold enough for the seeds to germinate (at N. Alabama I am guessing it is), then they should sprout come spring. Be careful though when weeding, they look very much like grass seedlings, just a little more fleshy! (Best advice I can give for that is to pull everything you know for sure is a weed, then go back and compare what is left to identify your new seedlings vs grass.) Your new seedlings will not flower in the 1st year; if they follow the same growth rules as many other plants grown from seed, I would expect the vigorous growers to flower possibly in the 2nd year and the rest in the 3rd.