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what i have success with, many people say isnt good. but.. in the limited clones i have taken, i'v had 100% so... anyways here we go..
took a cutting, with 3 nodes, and cut the bottom nodes leaves off, and scraped the stem with the back of a razor blade. Dunked it in rooting gel, and tried to get as much as possible to stick.
stuck the clone in a wet rapid rooter, put a plastic dome over it, sealed 100%(or close to, i put a pen lid under one side to keep it propped open just a little... the humidity however stayed at 92%), and placed a 42 watt 6500k cfl, about 1/4 inch from the dome. The cfl heats up the dome pretty good, but doesnt get hot.
2-4 times daily, i would mist them with 1ml of aquashield, to a 750ml mister, and let the dome sit off for about 10 min. and then put it back on.. (misting them was acutally enough water most of the time to keep the rooters wet) ..
i did this until i saw the first root poke out of the rooter, and after that, i left the dome off. and moved the cfl 4 inches away.
2 days after the first root pokes out, you should be pretty much ready to throw the clones into a bubbler, or a pot of soil etc.
i had my cfl on a 18/6 cycle, as i was doing it in the same area as the growing plant, and i know if i had the cfl on 24/7 they probably would have rooted a lot faster due to not cooling down to in the high 60's overnight.
if your rooters/rockwool or whatever you use, is cool to the touch.. your clone might not even start to root.. they like warmth, high 70's is great, try not to push past that too much or you may get them damping off. (which is why i used aquashield.. it prevents damping off, so i didnt have to worry about my temps as much)
one thing i will add however, is soon as you can leave the dome off without them drooping, i would, as i started to get a little mold on the rooter towards the end on one of the batches.
Nibec said it perfectly great job explaining all the details. I follow pretty much the same pattern with the one's I've taken, but I forgot to take the top off and they got mold once they root, thats also a great idea to plant them immediately. I let mine go too long, and even though they had huge roots in the cloning tray, I had to scrap them due to the mold issue.... excellent advice Nibec
+rep !