A YOUNG Vietnamese man who is hard of hearing thought he would come to England to earn enough money for treatment, a court heard. But Phuong Ngnyen was left in a house in St Ives as the lone gardener of more than 500 cannabis plants. After pleading guilty at Huntingdon Magistrates' Court to producing a class B drug, he was sentenced at Peterborough Crown Court on Thursday to 21 months in prison minus six days that he had already spent in custody. The court head that he had very little English and an interpreter sat next to him in court relaying the proceedings to him. Barrister David Lee, representing Ngnyen, said the house in Westbury Road had been let in April to a man called Kevin Ly. Police searching the property on July 15 found it had been converted to a cannabis factory. They found 516 plants, including cuttings, mature plants, some plants flowering and other plants in various stage of development. It was estimated that the total cannabis yield would be around 23.3 kilos. The estimated value was £131,638 if the best price was to be obtained. Ngnyen had admitted responsibility when he was found asleep on the premises but said that he had not bought the seeds, plants or the equipment.