I've been growing cempasuchíl (Mexican marigolds; "flor de muerto") for about 10 years; all propogated year after year. I acquired seeds at a Dia de los Muertos event and have had good luck growing them. They are about three feet tall. I had a really good crop of them this year!
Mexican marigolds are not native to the El Paso area, as they require a quite a bit of water. But they are well worth trying to grow!