SOme sooner than others. some hormones are suspended in an amino alcohol. the alcohol will kick and the rooting hormone is longer good. I use all types of rooting hormones and find vita-grow, KLN Root, and clonex gel to work great! So does dip n grow, but it dies off like vita-grow. Hormex lasts a while and you cant go wrong with a powder like supernaturals. I dont care too much for clonex and olivias cloning solution. it is much too strong. If you were to use it as directed you would be attempting to root at over 1000ppms. thats just scary! roottech works alright, but my best results are with clonex gel, KLN and vita-grow. I have had roots in 3 days with vita-grow when its fresh.