Ya know.. I was always a firm believer that MJ roots needed to go deep.. along with tomatoe plants...: )

But have you seen TRANOBLES grow? I know it is not outside and his plants are small.. but I think he said he only give them 6 inches of depth... 6 inches.... that is insane... and then again, so are his plants!!!

If it were me I would dig deep... especially if you are going to use this spot for years to come...