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

[turtle420]

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.

Sounds like good advice to me!

As to the lava rocks, the ones I'm using are your typical Home Depot BBQ lava rocks... just crush them a little bit so they aren't that big, and just use them. Definitely you HAVE to wash them before use. But they're good for that purpose.

There are some people that preffer lava rocks to Hydroton Pebbles, as the pebbles might shift and cause excessive stress to the girls' roots. In any case, to each his own. NugsNjugs' advice is good!

Best,

-turtle420
.