A CONVICTED drug dealer was able to grow a potent marijuana plant inside his UK prison cell. Prison guards were clueless that drug dealer Mohamed Jalloh was growing marijuana in his cell - and even decorated a four-foot plant as a Christmas tree. It was only when a jealous inmate raised the alert that prison staff realised the plot that had unfolded under their noses. However, prison guards had to use a Google image search to identify the cannabis plants.