I regularly do 4 photos in a 4x4. From breaking soil, veg for 5-6 wks then flip. You may have to tie down or supercrop the tallest to break apical dominance but will work. I have done 6 with 4 wk veg and Turned out well. If you are growing hydro, limit it to 3 and could get tight. Hydro veg is...