I'm not sure what that is but I've similar black spotting on roses that were infected with a type of mold. I'd avoid using outdoor soil for an indoor grow as outdoors soil will bring small bugs. Potting soil is sterilized at the factory and if bugs get to it, it's usually after you buy it and they get into the grow room. You can use outdoor soil if you want but it's less predictable. It's possible that the black spotting is a result of a deficiency; either that or it is a disease, not sure which. Since I don't know what that is, it's hard to tell you how to solve it.
polishpollack Reviewed by polishpollack on . After researching, I couldn't find anything on this What is your experience level? (novice, 2nd and soon 3rd grow) Your Equipment: .1) Type and wattage of lights. (400 HPS, 105w CFL) .2) Distance from tops? CFL, 15 cm, HPS 40 or so .3) Reflector type? (enclosed reflector for hps, bare bulb for cfl) .4) Is there a consistent fresh air supply? yes, because my attic is airy .5) Do you have an exhaust fan and a circulation fan? for the flowering room yes, for the little ones no, because they are out in the open in the attic .6) What are the Rating: 5