Can you use red lava yard-rocks for grow medium ?

[latewood]

Whats crackin all?

OK, if your gonna use red lava rock from your yard please put it through a serious bath first, soak it in PH'd water (5.5), then run it through your stove for 30 minutes to kill the crap from your yard.

Hydroton is basically expanded clay pellets that in no way compare to rockwool. Hydroton I believe is a brand name.
Peace.

This is the thing to do with yard rocks and soil, if you choose to dig up your own medium...
This is good advice.lw

latewood Reviewed by latewood on 02-04-2006. Can you use red lava yard-rocks for grow medium ? Iâ??ve heard people mention â??lava rocksâ?? as a grow medium, instead of Hydroton. Are they talking about special lava-rocks sold at a grow store, or the red lava-type rocks used for landscaping, that people use in their front yard in place of grass ? The yard kind is probably very cheap compared to Hydroton (they probably sell it by the cubic yard like soil). What I wonder is: 1) does it release minerals into the solution that would raise/lower the pH ? and 2) does the rock being red Rating: 5