Seeds

I've always grown using clones using indoor hydro/rock well method, but have always wanted to try seeds. I finally gave in and purchased seeds to solve my curiousity. I will be growing them indoors, in rock well same as the clones. I get the germination process, what my questions are... I know the seeds supply their own nutrients for a period of time. At what point do they stop and/or how can you tell they stopped supplying their own? And at what strength should the nutrients be when I start feeding them?

Seedlings start needing weak nutrients when the 3-bladed leaves start growing in. With organic ferts, half strength is usually fine but you can start with 1/3 strength if you want to be careful. Too much will hurt them more at this stage than too little.