soil problems

so...i planted couple of seeds outside in my garden , evrything is fine they grow really nice , my problem is that the soil is 30cm deep only in my garden , under it i have concrete BUT i have fully grown cherry and pears trees also in my garden since many years and they do fine with other plants and flowers in this soil....so will the MJ grow nicley thru the summer with the roots going on sides ?

yes it will be fine if other plants are growing well in these conditions. marijuana is a weed

sounds good to me man. cannabis roots usually only go down alittle ways then go out to the sides anyways, so you should be settin pretty good.