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Sheltie, when I need some weight in the pots, I use big pieces of lava rock in the bottom as my drainage, instead of styrofoam p'nuts. I always have a bag of it around, as I grow my angraceums, and some other species in it. When I started doing this, I was surprised to see how much the roots seem to like it, they grow right on down to it and wrap around them. You can get a bag of it from any box store.
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Renee
"I carefully described to Huxley the shooting out of the pollinia in Catasetum, and received for an answer, 'Do you really think I can believe all that?'" - Darwin, 1868
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