The men who ran the Switched on Gardener hydroponic supply shops must remain behind bars ahead of an appeal against their convictions and sentences.
Owner Michael Quinlan and general manager Peter Bennett were sentenced to imprisonment last month after being convicted of 16 counts of supplying equipment to grow cannabis through the chain of 16 stores.
Quinlan was sentenced to four years and three months in prison. Bennett, who was also found guilty of an additional count of possessing equipment, was sentenced to three years and nine months.
The pair applied for bail pending the outcome of appeals against conviction and sentence.
But in written judgments, released today, the Court of Appeal ordered the men to remain behind bars.