I use the lava rock as well for some of my orchids , but to be on the safe
side I wash it , and I boil it ...to sterilize it , better safe than sorry
as Mom used to say !
Mostly I grow catts. in it, seems to work fine for me.
Good Growing
Todd
"Debra Lewis" wrote in message
...
I ran across some bags of lava rock used for landscaping borders at Home
Depot the other day. Can you use this for orchids? If so, does it need
any special prepping or treating?

Thanks,
Debra