I’ve seen and tried all the methods we all know and love. Bubble and misting cloners, rockwool cubes, soil and even just a glass of water. I have NEVER seen someone use the “intermittent misting sandbed” for cannabis propagation though.
What is an Intermittent Misting Sandbed? Pretty much just as described. Mine is 2 beds, 3ft wide x 8ft long, with 6-8" of coarse sand in them. The Intermittent Mist is done with a cyclical timer with an operating window. Essentially this timer is programmed to open a 24v irrigation valve for 10 seconds, every 10 minutes, from sunrise to sunset. That feeds 1/2" poly line which then feeds 1/4" poly line to the mister heads. There are 4 mister heads per 8ft bed (1 for every 2ft works well with my misters). The beds are located where they get about 4-5 hours of late day sun, and its dappled shade early in the day.
And before you worry about the excessive water usage, its really not! I calculated 12 gallons a day using 24 misters, so each bed is like 2 gallons a day. thats an 8x3 bed!!! Most of us flush more down the toilet!
How does it work? Simple. Take a spackle knife, and make a slit in the moist sand. Go to your plant, take a 6-8" cutting, shove it in the slit and pack the sand down around it. Then walk away for 2-3 weeks (some stuff like coleus will root in a week, some more woody things like ninebark or purple sand cherry take 2-3 weeks, there’s literally over 100 landscape plants that can be propagated this way). I have NEVER used any rooting hormones or done anything special to the cuttings other than making the cut a 45 degree angle, and clearing any foliage from the stem going beneath the sand. I don’t even worry about razor vs the “crush” of scissors, and have even pinched cuttings with my fingernails, or stuck broken branches in without cleaning up the break. Stuff just roots. 90% of my front yard landscaping was done with this method (weigelia, ninebark, butterfly bushes, purple sand cherry, montauk daisy, russian sage, boxwood and pyrcantha to name a few).
So… To make a long story short. I am prepping my house for sale later this summer. So I won’t be here in the fall 
Good, and bad, but a new beginning is always more good than bad. BUT that means I will likely give up having property right next to woods, and I am DEFINITELY downsizing the yard and landscaping. Not sure I’ll have a mist bed at the new place, so I figured I would try this out before putting my place on the market, despite not being able to grow them out.
So. I had a few mother plants kicking around that were getting lanky. Since I have been shutting down my inside stuff as it finishes, I tossed them outside for shits and giggles. PLENTY of potential cuttings on them, so I said screw it! Lets experiment! (I likely won’t see those moms finish either, but will let my one neighbor know where they are so he can pull em in the fall). Took a dozen nice 6-8" cuttings, stripped the bottom 3-4" of leaves and shoved em in the sand yesterday.
Lets see how this method works… Knowing how fast coleus root in a mister, and in these beds, I am betting cannabis roots just as quickly / easily…
I have a few cannabis grow books that suggest using sand for rooting too so using sand is definitely a valid media for propagation of cannabis cuttings.
