Water retained by various soil ingredients

contact contact@bulbargence.com
Wed, 24 Oct 2012 10:58:40 PDT
Hello Del,
Thanks for this   information. In France this is called "pouzzolane" and 
comes in various sizes 0-5, 5-10, 10-20  mm.
I am using the 0-5 mm grade for mixing with compost  to get our  
pottingsoil. The 5-10mm material is used as a mulching layer  (2-3cm thick=1 
Greetings from south of France

-----Original Message-----
Pumice is volcanic rock which is full of gas bubbles and is so light that it 
will float on the ocean.Basalt is also from volcano's,but is a very heavy, 
dense rock,made below the earths surface.Basalt is often crushed,for its 
multiple minerals.  

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