Char-broil Lava Rocks for a Gas Grill for Orchids?
Are these OK to use as orchid media? I went to a store where I had bought volcanic lava for plants before but they had sent it all back to the warehouse and are already putting up Christmas decorations! They said I could order it and I did but when it came it was not labeled for plants, it was Char-broil brand lava rocks meant for use in gas grills. Do they add any nasty chemicals to that stuff or is it really the same thing just marketed for a different use?
Basically, would this be safe to use with orchids? I didn't buy it, but for future reference it would be good to know.
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