Rockwool??

can you grow with rockwool cubes without the hydroponics system?

Yes, But Keep Upping Your Sizes. Watering These Without A System Will Change Your Mind, Rockwool Breaths Great. I Only Use For Cloning And Then Trans. To Dirt.

I know you can start your clones in rockwool cubes and then transplant them into dirt. I am not sure about growing them in there the entire time.

what if i use like a big tub and fill it with a lil water and just let da cubes sit there?

Then you are on;y a step or so away from hydro.

Why does it *have* to be in rockwool for its life?

I Seen Rock Wool In Hugh Cubes With 1"+ Holes For Stock. They Use A Bucket Full Of Marble Looking Rocks To Help Stand Up The Plnt. But Its Nocking On The Door To Hydro, There Was A Watering Sys. In Place On Timer. And Drainage Systems As Well.

what about peat pellets?

I use rockwool and peat plugs. Both are used for clones or seedlings then once larger enough, transfered to either soil or hydro. If you wanted to continue the grow in rockwool, I think you would need to start it in a very large cube so no transplanting required. I think it would work, not 100% sure though.

i use rockwool cubes (big n small) small for my clones and big for when the roots get bigger so they sit in the hydro tubs better.. they can be used in soil aswell and dont do any harm whatsoever to the plants..
if your thinkin bout placin them in a tub of water then ide suggest you add air to the tub..

why dont u make a bubbler.. i made 1 from a bucket n lid. i just added an air stone n pump... if you look in my journal you will see the white rhino sittin sweet in it..
there very easy to make and work extremly well.

you mean a bubble like in fish tanks?