I believe this was addressed before. But basically with pua kala just scatter seeds in the area in full or part sun and pretty much forget about them. You will see little bluish-green prickly plants pop up here and there. Sometimes they will come up in a matter of a couple of weeks; other times not for months. Not sure why this happens. But don't give up. Do not mistake them for weeds. And too much water will kill them! No seed right now.
Aloha

LOL, I know how to plant them just cant find seed! Mahalo!

Kaimakaha,
Send me a mailing address and when seed become available I'll put some in the mail for you.
deweydave2@hawaii.rr.com
Aloha