I got 9 or 10 that I planted about 5 or 6 years ago. They bloomed for the first time last year. My bees didn't go after them like I thought they would. There were a few bees on them but I guess they had something better at the time.
You will have seeds(lots of them). I cut them off my trees last year(the ones I could reach) and after drying them and separating the seeds from the pods, I ended up with about a half of a 5 gallon bucket of seeds.