Coarse sand gives me the best results for onco seedlings, with a little loam or clay mixed in, and topped with coarser grit. I found that the roots did not mind moisture, it is the rhizome which must not be soggy. Hence covering with the grit rather that more sand/ compost. Rather than "wick" the pots, trays of sand to stand them on works very well. Peter (UK) On 20 October 2015 at 20:24, Rimmer deVries <rdevries@comcast.net> wrote: > 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. > >