Yeah, even for a soil grow you should still pre-treat the cubes. They are hydroponic until you stick em in dirt, remember!
If you don't want to fuss with that, try peat pucks or rapidrooters. I find RRs to be superior to RW for seedlings that are destined for a soil grow.
stinkyattic Reviewed by stinkyattic on . ROCK WOOL SEEDING HELP this is my first time using rock wool for seeds. does anyone really bring the PH to 5.5 like the rock wool directions really say? this would be used for soil grow. not hydroponics. thank you Rating: 5