keep them in there present state till they're about 5 to 6 inches then plant them into your final medium. if your growing indoors don't use rockwool to grow them in. go to a hydro store and get some cocos medium. i use it as it's sterile and you will not introduce any parasites to your grow room, most parasites are introduced to a garden by the medium you use. i've tried other products and i will never use anything else. i have a pretty large grow and hydro is the way to go. don't skimp on the chemicals , use the good stuff and it will reflect in your yeild...........good luck