I tried my hand at growing some Japanese Black Pine from seed this year, and have had some decent results. I bought my seeds off ebay and when the time came, I soaked them in a cup of water for about 2 days. The ones that sunk to the bottom were good to use, while the ones that float were either empty or infertile.
Around the middle of April, I put together a seed tray filled with the coniferous soil from New England Bonsai Gardens. In the cells I was planting the JBP, I filled the top quarter-inch with sand. I put the seeds in attached the humidity dome to the tray.
I went on my honeymoon from about May 5th to May 15th, so the tray was basically left as is for over a week. I was a little worried that it would dry out, but the opposite result had happened. By the time I got back, there were some sprouted seeds!
At the end of June, most of the seeds that would end up sprouting had sprouted. This isincluding a few extras I threw in a separate seed tray.
Part two will consist of making the seedling cuttings, as seen in the Stone Lantern Pines book. I have had mixed results with this, and took only about half of what sprouted and made cuttings.