When you transplant you don't 'change' the soil; you are simply putting the entire rootball with all the old soil still attached in a larger pot with fresh soil.
The roots need to be able to keep growing as the plant grows larger.
Personally I distrust Miracle Grow soils because they are peat-based and contain fertilizers that you willl have a hard time getting the feeding schedule right because of. Oooh that was awful grammar, lol, but i'm too baked to go back and change it.
The Miracle Grow organic is not that bad if you add some extra perlite to it, but a quality potting soil is a wonderful thing.
You still will be giving liquid fertilizer during bloom. Flowering cannabis feeds more aggressively than the ferts in that soil will be able to provide for, and at the wrong ratios of NPK. The amount of Nitrogen in pre-ferted soils isn't great for flowering; it can lead to leafy growth and not as much bud.
stinkyattic Reviewed by stinkyattic on . Question about changing soil Ok here we go. I have a friend who is growing and asked me this question and I have no idea what to tell him. He has 3 seeds from bag (good shit too...:thumbsup:) that he is growing in 10" pots with Miracle Gro moisture control soil. He is worried about the soil having enough nutes to last through flowering. He says he is gonna veg for about 4 weeks before flowering but wants to replace the soil with the same type when it comes time to flower. Would this be a good idea for him to do? I know Rating: 5