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

[skunkydelight]

I heard mixing lava/vermic to 4 to 1 ratio is great to, but I am a first timer, listening to advice. Also, something about using vermic at the top inch or so being it tends to wash down after flushing. HELP !!!!

4/1 ratio in a soilless grow would be good, but in that case you would use regular soil pots...you can't use vermiculite or perlite with net pots...
-sD

skunkydelight Reviewed by skunkydelight on 03-04-2006. 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