well, i've been wondering on the street with giant Poinciana's in Miami for years, and i've never found any seeds in dropped pods. and it's not like there are people picking them up...nobody cares ... so, where do they all go? it's a mystery.
but this past May finally i spotted a cracked pod with seeds. they could be 6 mo old for all i know...so i took extra effort with soaking in hot water, nicking skin, etc.
so 1 sprouted in 1 week, that's good, the rest we'll know soon.