Ulu is naturally a leggy tree (older trees, especially in thicker jungle, have long twisty branches, ie in older areas of Hilo)... may be tough to keep it hedge-like years from now, and by cutting it so often will fruit less because the fruit take a while to form and form closer to the ends of branches, unlike a jakfruit...
the main species of Ulu in Hawaii rarely seed anymore (mostly nonviable seeds, all screwed up from being cultivated for so long)... ie almost every single Ulu you see was planted in its location or are descendents of older ones planted long ago (root suckers). If you can get a seed to germinate (rare), it will take up to 15 years to fruit, while a root sucker or cutting may fruit in as little as 3 years.
if you want to propagate your own and not spend $50 for a single small 'tree' ...
you need to air layer, try cuttings, or dig up a root sucker (best way)
fwiw, I dig mine up (root suckers) along the roads and ditches up Hamakuka way, a few of them in the thickets near Kolekole Beach Park, and Hakalau Bay and along the 4 mile scenic route up there near Onomea Bay...
good luck
http://ntbg.org/breadfruit/breadfruit/propagation1.php
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save our indigenous and endemic Hawaiian Plants... learn about them, grow them, and plant them on your property, ....instead of all that invasive non-native garbage I see in most yards... aloha