Take a stem tip (soft / semi-softwood), preferably not flowering, not too skinny, about 10cm long. Strip off the leaves from the bottom 2/3s, split the stem slightly, and dip into liquid/gel rooting hormone. Put the cuttings into jiffy cubes, spray with water and then seal in a rooting chamber – I use the container from a supermarket cake – the type that has a clear plastic dome that fits into a black plastic base. then I cover it with paper and put on in the windowsill and cover it with paper so that it doesn;t overheat, then LEAVE IT for 2 weeks – don’t open it, don;t move it, just leave it. Roots appear out the side of the jiffy cubes and then they can be removed, hardened off and planted outside.
I use this method for many plants – it works well with Salvia, although is not strictly necessary as it will grow roots fine after 2 weeks just sitting in a glass of water. It works very well for C. sativa (I read about it in the NZ NORML News magazine in 2009 – one of the issues that the NZ Police tried and FAILED to have banned by the NZ chief censor).
As far as the effects of wild dagga go – I did smoke a joint of some flowers a few years ago, but the effects – if any – were so slight as to be possibly caused by placebo effect – I’d just stick to the real thing. But it’s still a lovely plant to grow, and the nectar tastes great – just watch out for ants harvesting it when you suck it out!