I have a question. If i have 4" Rockwool Cubes can i place them in a tray with NO OTHER MEDIUM, and have 3 - 3.5 foot plants grow out of them with no problems? This is similiar to what Dadio161 does with 6" Rockwool cubes. I have seen Dadio161 place his 4" cubed Rockwool onto 6" cubed Rockwool but I don't have the height space to give up 4 inches like that. The only reason I ask that question is because I see people using 2" net pots and neoprene collars in aeroponics to hold up plants with massive stalks so i was wondering why couldn't Rockwool be just as effecient.
If this can not be done, my 2nd (and 3rd) question is this: If I use hydroton to cover the remaning area of my tray that my 4" cubed Rockwool sits in, Can i still flood up to 2" of the tray for 15 minutes and the Rockwool "wicking" abilities would still work fine with the hydroton cover the bottom part of the tray (eventually covering the roots)