The series premiered on demand on November 23, 2015, and on Syfy on December 14, 2015. A 13-episode second season premiered on February 1, 2017. In March 2017, Syfy renewed The Expanse for a 13-episode third season to air in 2018.
Perlite is an amorphous volcanic glass that has a relatively high water content, typically formed by the hydration of obsidian.
Perlite may also be used 100% - provided that it is kept wet at all times by capillary irrigation or intermittent mist. Sprinkle fine peat over the seeds, and cover with glass or plastic to retain moisture until the seeds have germinated, and then feed.