I'm putting this here because it seems to be an uncommon method. Has anyone tried a foliar rooting hormone? I see there's a couple of approved brands for this particular use. I ask because the last clones of gg #4 I had took three weeks to get like half inch roots and yellowed up on me. Also, about a third to half didn't root. Luckily I got enough. I was using a bubbler cloner fed by a 100 and a 300 gallon air pump for 20 gallons of water. Used an aquarium heater (added a week in). Light proof with 10w/sqft of fluorescents. I did cut them under water and lightly scraped the bottom layer of green off the stem. I think that was a mistake, no roots came from that area. Jorge cervantes mentions a 50ppm solution but the one I got says that the ideal solution varies. I doubt he has tested half of what he's wrote so any experiences?