I use a bubbler(s) and have near 100% success rate with the dozen or so strains I've grown over the past year. There's time difference for rooting and root growth rate between strains, but I'm not sure the rooting is so strain dependant as grower dependant. The root growth rate is strain dependant I believe.
I've got Flo and Super Strawberry Diesel in the bubbler now, the Flo took about 5 days to poke out the first root. The SSD were put in a few days later, I expect them to start to show roots in 2 - 7 days. Kali Mist clones ok, Bubblegum is a quick rooter, Red Diesel clones well, Big Laughing always takes a couple days longer than the others ... get the procedure down and it's 7 - 14 days with no worries.
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I second that, I have always used aero's until last go round, forgot to turn the pump back on and I lost all my clones including my only cut of my favorite plant. Was double my fault for only having the one cut but ya, grower mistakes + aero don't mix wellUnless you're already into hydro go with the bubbler over the aeroponics - idiot proof and easy, more forgiving to grower mistakes.
i made this one for about 15 bucks at Ballmart and Homedeepthroat for the paint as you do not want light in the water NONE. Order these and fit them into a bubbler of your own. I will attach pics of my bubbler and the name of the starter mediums too if you want to go that route check it...
Rapid Rooter Plugs on egay. Biggest part of cloning is the right starting medium as she is shock and does not need any more static like Nitrogen in the soil when she wants Potassium to Root Etc.. That is why the Bubbler works for a lot of folks it is fool proof with no Nitrogen in there. But really check the Rapid Rooter and Use Olivia' get and 24hour light not to intese and also higher humidity like a dome for them. I use the plastic containers from food or fruit sold at the local costgo or super mkt.
Jack the Ripper is very easy to clone roots in 10 days using rockwool and humidity dome.