I changed the water about once a week and planted into coarse perilite mixed with vermiculite until rooting really took off. Im sure its not the fastest method of rooting but if I had a really rare or hard to get cutting i would use it because 100% success and no mold. Worked 100% on desert king, negronne,ras latte, black mission, md berry, genoa white,hardy chicago, sals, sicilian red, dark portugese, italian everbearing, vista, mars vs black, and sorbello red.