Sure, many people here do it. You can do a search for "gritty mix" and find many posts. There are lots of strategies, and the exact mix depends on your climate and the particular plants. My go-to mix is around 2/3 granite grit and 1/3 Turface, a bit lighter on the Turface for plants that like it drier. (For best results, you should sift materials to get rid of the fine particles that are smaller than about 1/8", and rinse to get rid of dust.) Folks on the American west coast often use pumice; perlite is also an option, and some people use bark as a small component.

I know, haha! & I thank you! :)

Michael19, thank you! I couldn't ever find an exact answer on the internet. I honestly had given up looking around everywhere. So much thanks for your advice, & Sue's!!

Hey,

So, the short answer, is yes, you can grow in an entirely inorganic soil.

HOWEVER:

What you use is important! Especially particle size. You want to shoot for 1/8-3/16 inch sized particles. I have attached a few pictures for you that may be helpful:

Here is some Turface (actually it is oil absorbent, but it works):

Useful Pictures · More Info

Here is some perlite:

Useful Pictures · More Info

And last, chicken grit (crushed granite):

Useful Pictures · More Info

The chicken grit is the closest you will actually get to 'rocks', but growing in 100% grit will lead to dehydration of your plants. I do a 1:1:1 mix with all three components. These pictured here are sized correctly.

Here is another thread that you may find very helpful on these topics:

http://forums2.gardenweb.com/discussions/2842847/container-soils-water-movement-and-retention-xxii?n=742

Enjoy!

~palmsandsnow

Thank youu!!

Absolutely, as mentioned above. =)

Using this:

thank you !