Share 'Edible Giant Pandanus'

Hi there, I am looking for edible giant pandanus leaves ( or at least non-poisonous). We use them to wrap sticky rice dumplings in (also known as nyonya dumpling). Around this time of the year in Singapore it is sold for the home cooks but I never am able to catch the season as I am here in Singapore, and I am unable to get a scientific name for it from the food sellers.. Can anyone help?