One of my favourite asian greens and I eat it raw and in stir fries. It is very easy to grow, harvest and then retain the seeds for the next planting. Initially I used Mr Fothergill’s seed tape product. See http://www.mrfothergills.com.au/seeds-vegetables/vegetable-seeds/asian-greens-seeds.html.
New growth sweet tasting and very mild. Older leaves can be a bit bitter raw but fine cooked.
I used Ben’s tip for collecting seeds using a plastic bag:
Keep this plant well harvested to encourage young growth. When you are ready let it go to seed, in my case around November 2016.