For right out of the bag stuff, I get great results with COM - Stonington Blend. I have used it 5 or 6 times and its the only stuff that doesn't need any amendments from start to finish. Really you don't need to add anything to it but I do add 20% more perlite. Anyhow... I usually veg my plants for 10 - 12 weeks, and still all I have to give them is water from start to finish. But as a side note... I do leave a few inches of space at the top of my pots when I start them, and at the start of the 3rd week of flower I add a 1 -1/2 inch layer of COM - Stonington Blend to recharge the pot!