I pretty much follow Pipemans method with rapid rooters, if I drop a seed in Rockwool its pretty much a death sentence to the seed even if it has popped. I just rooted some Blueberry and Pineapple Express cuttings in rapid rooters, I didnt want to break out my home made aero cloner for just 4 cuttings. The blueberry was an after thought so I just cut them and stuck them in rapid rooter. The Pineapple Express cuttings got a double dose of clonex, Azos, of course the blueberry showed roots after 7 days