I use fine as well as small pumice (I think that's what you would call it - here it is called tuff) mixed with sand and a bit of sandy soil(sold in bags here) in my inorganic cactus mix as well as for Atacama bulbs and other that rot easily. (We have cold wet winters, but not freezing.) I also use the fine with sand for germinating seed of drainage loving plants with good success. \ Shmuel Jerusalem Israel Zone 9 On Tue, Jul 2, 2013 at 1:47 AM, Ina Crossley <klazina1@gmail.com> wrote: > I've been mixing the pumice with some potting mix. I thought that would > offset any gaps. Anyway, I gave up the washing idea as it is far too > time consuming. > > Thanks for that Dylan. > > Ina > On 2/07/2013 5:38 p.m., Hannon wrote: > > The fines are not harmful and can be very helpful in coating live roots > and > > root hairs. Washing pumice deprives roots of needed insulation and > > moisture. For most plants there is such a thing as a medium that is too > > coarse and aerated. > > > > Dylan > > > > * > > > > > > * > > _______________________________________________ > > pbs mailing list > > pbs@lists.ibiblio.org > > http://pacificbulbsociety.org/list.php > > http://pacificbulbsociety.org/pbswiki/ > > > > -- > Ina Crossley > Auckland New Zealand zone 10a > > _______________________________________________ > pbs mailing list > pbs@lists.ibiblio.org > http://pacificbulbsociety.org/list.php > http://pacificbulbsociety.org/pbswiki/ >