Best instance, to take your replicas(clones) is when the "Momma" is in a Veggitave state,ABSOLUTLY the healthiest "Spriggs" should be used--Cuttings shouldn't be extreemlyLlite green, as this is an indication of a bit too much Nitrogen,(in my opinion) and rooting marijuana plants, don't like Nitro, when trying to root. I've cut offspring from a 3 week old Northern Lights,('Bout 14 in'' tall w/5 nodes, and they ALL popped roots, in less than two weeks. This all depends, on what you're growing bro= some take a bit longer than others, but as a general rule, if it isn't "Up & Growing" in 3 weeks or so, better check the bottom of the stock, it will probably be shrunken up, and not allowing the passage of water, or "Nutes" to the cutting... Pull from medium, "Re-slice" the bottom of the cutting, "Re-gel" the cut you just made, wrap in sterile white gauze(just two-three wraps), and stick it back into the medium it was in,adding a small amount of "Rooting Solution" to keep moisture around the bottom of the stock,and set the cutting under a "Moisture Dome",as before. This has ALWAYS worked very well for me,(thanks to my Mammie!),and with a little "Trial & Error" you'll be battin' a 1,000 !
I Hope this will help, but if not===READ DA BOOK !!!
Shoveldon
(Here's mud in yer face!)