Well-drained growing media -- Sponge Rok versus perlite
gardenpt@aol.com (Tue, 06 Oct 2009 20:21:26 PDT)

Sponge Rok and perlite are the same thing-- the first is a brand name
for the second. Comes in various grades -- fine, medium and coarse (at
least that was the case years ago)

It was said:

Another option is to check around for "sponge rock".

-----Original Message-----

From: Eugene Zielinski <eez55@earthlink.net>

To: Pacific Bulb Society <pbs@lists.ibiblio.org>

Sent: Tue, Oct 6, 2009 5:48 pm

Subject: Re: [pbs] Well-drained growing media (was Oh No! A
Boophonedisaster!)

Another option is to check around for "sponge rock". This is large
sized

perlite that some orchid growers use in their growing media.