In your area, the A. curassavica is perennial. In my area, they are an annual. In my zone 7 garden, I can get them growing from seed and bloom, if I planted them from seed at the beginning of August, I'd have blooming plants by the end of September. But, we sometimes get hard frost by the end of October. They start slowly from seed, but zoom when they get mature. Cuttings can be taken and rooted by just making sure you stick the leaf node down into the soil and keep them watered.
Herndon, VA (USA)
Take care of the small things....