Soil question

I bought an universal soil for homegrown plants. there is no information about ph levels, nutrients etc. it is only said that there are organic nutrient and that the plant will grow hall year without need of nutrients. ofcourse it is imposible for cannabis. So, is this soil good for cannabis? and how long can I grow cannabis in it till I'll have to start adding nutrients ?

should be fine. just keep this in mind so not to overfert. you can get a cheap soil test kit and test the soil before you add any nutes., just to see what your working with. it should have a ph tester too.