I have a colubrina about 8y.o in the ground for about 3 years that is now about 6m high with a spreading crown of over 5m wide. It flowered first about 5 y.o. and did not set seed until last year at 7 y.o. when I got about 50 good seeds from 6 or 7 pods. Despite (or perhaps because of) extreme drought conditions it has flowered well already and produced 20+ pods that are just ripening. It then went and flowered en-masse a few weeks back. Should have lots of seeds soon.
I also have 2 peregrina in large pots... they seem more finicky and delicate (perhaps because of the subtropical and not tropical conditions). I hope to get em in the ground soon to hopefully get em moving..