There is not a definite horizon between the layers. depending on the size of the bulbs I will mix the adjacent components from 1 to 3 inches (2.5 - 7.5cm) deep in about equal proportions. For the bottom layer I do this below the bulb, and then I mix my top grit above the bulb, for those that are completely below ground. I just started doing that recently when Babiana pygmaea started their seasonal growth then several suddenly rotted as the mix they were in was retaining too much water. The survivors and the few others I tried this with seem to be doing fine. Randy Monterey Bay Area, California USDA zone 9 Eclectic interests including Irids and Amaryllids On Wed, Feb 1, 2012 at 10:11 AM, Alberto Castillo <ezeizabotgard@hotmail.com > wrote: > > Randy, are you using your mixes in layers? > > > > _______________________________________________ > pbs mailing list > pbs@lists.ibiblio.org > http://pacificbulbsociety.org/list.php > http://pacificbulbsociety.org/pbswiki/ >