Instead of growing it from scratch, ask for a twig and plant it. It will grow to a shrub. Try your local agricultural stores if they have the seed of Tuba-tuba.

Manila Seedlings Bank have alot of them. But if you're in the Visayas area, i know public schools have a lot of them. Or you can ask your friendly neighborhood sari-sari store, i'm sure she knew a friend or two who have tuba-tuba in their backyard. it's easy to propagate. you don't even need a seed to start with, just break a good mature branch, stick it in a suitable ground and in a month, you'll have a nice tuba-tuba growing. believe me, my mom has two tuba-tuba trees.