another thing to do is to put a small weaker layer of dirt between a stronger dirt and your plants roots, doing this will help in minimizing burning of the roots/plant from strong mixes. it gives the roots a chance to adapt to the stronger soil

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http://boards.cannabis.com/basic-gro...-dankness.html
complete guide to mothers clones and trimming roots http://www.cannabase.com/cl/index.html
these last 2 links have most grow books to read http://greenmanspage.com/guides/ growmoreweed.com