All I can say is that it's just contrary to what I am doing that is *working 100%* so far (7 out of 7 rooted), though admittedly, I'm not using rockwool, but Jiffy (peat) cubes - but the concept is similar as peat is also very hydrophilic like the rockwool, and I always hear "squeeze the excess water from the jiffy cube" (which I don't do). Its also contrary to the fact that many people successfully root them in straight up water, no medium at all.
I'm getting to a point where whenever I see sites saying "this is the best method" with regards to growing, I take it with a grain of salt. There is just so much info being passed around as gospel that just isn't really true when you examine it a little deeper.
The second or third one I pulled went over limp the next day - I looked at it, and noticed that, 1 - the stem was not pushed very far down into the cube, and 2 - the cube was just damp, not saturated. I added more water to my tray, and pushed the stem farther in, and put a little water right on top of the cube. Then I put it back under the dome. Within a few hours it was looking normal. OTOH, my brother, when he was growing a couple years back, never could get a clone to take. I don't know the specifics of the method he used, but he said he followed all the guides exactly, cutting with the razor, putting them in the rooting gel and all that.
Anyway, here are some pics of my setup:
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This is the plant I took the latest clone from. I mainly just wanted to reduce it height and slow it down as it was getting to tall. This is a Jack Herer.
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I actually left more foliage on this on than I usually do, and it actually did wilt more than usual the first day, but stiffened up after about 36 hours. I believe it was Wednesday evening I took this one. You can see there is water in the holes of the seedling tray.
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And here is the tray with the dome in place.