Because, Leo, that is all I could buy when I went looking for it. They would work just as well each on it's own. Ina On 3/01/2013 1:25 p.m., Leo A. Martin wrote: > Nice work, Ina. Why the mixture of vermiculite and perlite? Why not just one or the other? > > Leo Martin > Phoenix Arizona USA > > _______________________________________________ > pbs mailing list > pbs@lists.ibiblio.org > http://pacificbulbsociety.org/list.php > http://pacificbulbsociety.org/pbswiki/ > -- Ina Crossley Auckland New Zealand Zone 10