Well, I haven't used it on MJ before, but I have seen problems develop with soil pH (and eventually nute lockout) over long periods of regular application in landscaped gardens. But if you're making irregular applications (like less than once every two weeks), you won't build up enough in the soil, quick enough to make a difference.

Just read the directions, don't over-apply and you'll be just fine. Lookin' good, btw.
CityOfThunder Reviewed by CityOfThunder on . CFL Cab Grow Log... My First grow went ok but now I have a better setup. Since I learned all i know from here. I thought My second go around I would share to learn more myself. These are the plants after 1.5 weeks from Sprout. This part of my cab I decided to try the Home Depot route. 27W CFL 6500k 5 right now. In the top of the cab I have a T5 light. So far the T5 Grows faster even though the lummes output is matched with the HOme DepotLights. I believe this is because of the reflector the T5 has. Regardless Rating: 5