I use rapid rooters, and seed starting mix,in small cups to start them for a week or 2, then transplant into 44oz cups with used supersoil mix. After 2-3 weeks in the 44oz cups, I transplant into 5 gal buckets with supersoil. The 44oz cups will be full of roots after 2-3 weeks,and have already been topped,and branching nicely. Once transplanted in 5 gal buckets, the plants really take off fast. I will veg for 2-3 more weeks, then flip to 12-12. Just make sure to put 2 3/8 inch holes in the bottom of the 44oz cups so they will drain properly. Those 44oz cups are Styrofoam cups I save from polarpop drinks I buy at circle k.