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