Bob i heard at a bonsai show lecture, (method also used by Streptocarpus growers ) that if you put a piece of yarn in the pot extending down you not only keep the pot media moist by adding a wick to soak up water from below, but it also lowers the water table in the pot. think- hydro communication with the media below. they recommend a yarn that does not rot, so not cotton but Orlon or some other synthetic yard. Rimmer SE Mich USA Zone 4-5-6 depending on the winter. > On Oct 20, 2015, at 3:10 PM, penstemon <penstemon@Q.com> wrote: > > Putting screen in the bottom, which is, of course, the only way to prevent the growing medium (in my case, perlite) from falling out, will still create a perched water table, but hopefully far enough down in the deep pots to prevent root rot. > Bob Nold > Denver, Colorado, USA > _______________________________________________ > pbs mailing list > pbs@lists.ibiblio.org > http://pacificbulbsociety.org/list.php > http://pacificbulbsociety.org/pbswiki/