I am only familiar with Hydroponics DWC, EbbnFlo, NFT, and the other numerous forms of Hydroponics. I do not like soil techniques as it just adds WITHOUT any benefits more problems like its MESSY and can contain bugs, bacterias, and Fungi. Its wasteful and more often than not the soil is not reusable. You can reuse it but its depleted of natural nutes and the trace elements and components breakdown to nothingness (lack of a better word). I'm not a "Veteran" grower but have had several successful crops in my growing experience and I'm an avid forum reader...not so much a poster. I read all the bullshit and only post a few compiled, accurate posts ever so often.
1. Pick a plant
2. Count down 3 nodes (Each "Y" section) starting from the tips of a branch.
3. Snip the branch nothing special or accurate.
Once all your clippings (as many as you can work with in 5-10 minutes) are taken its time to move to the prepping stage
4. Measure down approx. 1" from the 3rd node and make a diagonal cut under water...(much like you would for flowers IE roses or what not).
(NOTE: Pinching does nothing but cause damage. You would think that it would force the void of water to the tip that was cut but in reality its not a vacuum. Its a living thing. All your doing is crushing and damageing the integrity of the already formed cells and rupturing the cell walls on a microscopic level. This is just additional stress and damage that the plant will fix, taking more time and extra/access nutes that would have been better used for natural growth later at the end of a water changing cycle IE it used the nutes earlier to repair what you crushed.)
Tip...use treated water. 5.5 pH, superthrive.
Sounds like a pain but it can all be done with garden snips (I prefer a surgical surgical scalpel or Exact-o-Knife, snips, 1 cup of water, and a couple drops of superthrive).
If you slice the surface or score the last 1/2 inch on all four sides of the round stem this will give your clone more of an exposed area of the plant that the powder or gel can seep into thus making the root-able area MUCH greater than just the bottom diagonal slice.
5. Dip the Clone 1 inch into your rooting stimulant. Tap the plant on the edge of the container to remove any access.
Weather its a powder or a gel dipping in water is unnecessary. The plant has microscopic hairs that will hold all the necessary rooting stimulant.
6. Place the clone 1 inch into a 1.5x1.5 inch Rock-wool cube.
Tip...pretreat your cubes with Superthrive stress release solution and adjust the pH to 5.5 and soak over night.
Thats it at that point your growing.
Its a different topic keeping them alive after that with proper nutes, superthrive, etc. Misting, and lighting.
Mother plants AND clones are best kept together under 24 hours of artificial light. sticking to the golden rule of 50W per sq ft of growing space.
BUT commonsense says that if your doing SoG your light may not reach through that canopy of the leaves. So more wattage and Llumens may be necessary.
I would say keeping an eye on the clones daily and misting as the leaves look dry is the most accurate statement since everyones lighting will vary from Wattage, Llumens, spectrum, and distance to light source as well as heat, humidity, and many many other catalysts you could tweek as your learn about them to improve upon perfection.
Once finished i would suppose the only question someone may have would be how deep into the water should the rock wool sit? It can sit as deep as you like so as to not completely submerge the cube and so long as it or the roots touch the water so the cube will consistently stay wet. Keep in mind that your roots will grow into the water as it needs more. How fast and densely the roots grow will all be adversely affected by the amount and types of nutes, pH, your lighting setup, and humidity.
As for the clippings dipped in powder and placed in water alone will give you a problem later of placing the rooted clone into a substrate. To me its just an unnecessary and completely ADDITIONAL step. ALSO you are washing off or MOREOVER diluting the rooting stimulant at that point and I would bet that you could be getting MUCH better results by not doing so OR using a Rooting SOLUTION not powder or gel which is a rooting Stimulant. Two completely different things and if combined will give you the best results.
Superthrive is a solution that heps with stress and fatigue of a plant/tree. IE Contains elements that FORCE water/nutes into the plant on an atomic level if you can look that close.
(NOTE: It will and HAS brought brown, dead, dry looking plants back to luscious green healthy life so to speak. Its also got a 100% guarantee or money back.) You form your own opinion.
Rooting Solution is a liquid solution that promotes root growth. IE Root Solution from Green Light
Rooting Stimulant is a powder/gel that encourages roots to form. IE Root Stimulant from Schultz