Originally Posted by Mr. Clandestine
Like others have mentioned, MG soil isn't going to cause your crop to fail, it just may mess with your own feeding schedule causing you to initially need slightly less fertilizer than you planned on using. I've also used the organic MG mix before, and the only problem I had with it was slightly overfertilizing by accident, as Rusty pointed out. Besides that, I really never had any problems with it. Miracle Grow isn't exactly tailored for the needs of these plants, but again, it'll still work in a pinch. As for a good unfertilized soil, I've heard good reviews from people who use Promix... but it was only used for the early stages of veg, so I'm not sure how appropriate it would be for late veg and flowering. I guess just using that and perlite would qualify as a soilless mix, so you'd really have to be on top of a feeding schedule to make it successful.
My soil mix is pretty simple, but it's constantly changing. The soil itself consists only of black velvet mushroom compost (.5-.5-.2), black peat moss (or humus, when I can find it), and perlite. Added into the soil are several other amendments, like blood meal in veg/bone meal in flowering, earthworm castings, a product called 'Plantone' for the mycorrhizae, and lime. I rarely need to fertilize at all while the plants are in veg, unless I veg them out past one month. My flowering mix is pretty much the same, only a little more perlite is added and the worm castings aren't added at all. From there on out, it gets fed guano and molasses.
It works well for me because I've done it this way for a while. If you decide to give it a go eventually, start out small with your soil amendments and work your way up with each consecutive grow. I had to find out the hard way how NOT to add organics to the soil, and it wasn't pretty (or pleasant smelling).
Take care. :jointsmile: