On Sat, 28 Apr 2007 17:54:08 -0400, "Roy"
wrote:
This stuff is red and I bought it at Walmart or K Mart .
Roy
"P Max" wrote in message ...
Its interesting that you use lava rock, Roy! The growers in tropical Nth Queensland use what we call "scoria" as pot media, with great results. Its probably the same thing as your "lava rock". Its the light bubbly rock ash spewed out during ancient volcanic eruptions. They say its the only media that works up there, as the tropical conditions breaks down organic mediums too rapidly. Scoria is perpetual - doesn't disintegrate. However, scoria from the quarries in my district is very alkaline ( 9) and so I hesitate to use it.
Peter


It is the same idea. Here they use it in landscape if your from the
Midwest and do not understand the winds. The second year you put down
crushed rock or river rock as all the lava rock has blown away. It
has a tendency to have glass like edges in places where it breaks. I
used it in a too small container and it crushed resulting in sharp
shards. In large pots or very large pots it helps reduce the weight
but still gives a rock style air pocket.
SuE
http://orchids.legolas.org/gallery/main.php