There isn't a preferrable soil for LR2. Any commercial quality soil will be fine. Just avoid those that claim to feed for a certain amount of time (like Miracle Gro). You DO NOT want soil with time release fertilizer in it. If you can find it in your area, the previously mentioned Fox Farms soils are highly recommended too.
fox farm is allmost same as plagron so they are the one of best...you can believe or not i dont matter! ^^
ive just ordered me 5 feminized lr2 seeds,i plan to purchase the foxfarms mix,from wot i have read,its the best you can get
ive read the FFOF can burn plants pretty easy if u just use it as is. Anyone have a favorite mix? for ffof?