The germination info I saw is in a comparison between Turnera trionaflora and a weed. It doesn't look like they did anything special with the seed, saying that, "seeds will germinate under a wide variety of conditions", "50 percent of the seeds germinate immediately with adequate water but dry seeds will remain viable for at least 18 months", and "plants flower within ten weeks after germination". The author of the paper germinated the seeds in a greenhouse in soil filled flats. Seedlings were transplanted at 8 weeks to 8 inch pots to grow to maturity.
You might even find it worthwhile to read this paper if you can - a very interesting plant, especially regarding pollination if you are looking to collect seeds from your own later on. If you want to know more and can't find the paper, dmail me and I'll try to give you a brief synopsis of what I read.