Two Vietnamese men appeared in court accused of the production of almost £1,000,000 worth of cannabis at an address in Grantham.
Huu Duc Tran, 27, and Hung Trong Le, 31, both deny a charge of together being concerned in the production of 1,574 cannabis plants.
Jim Clare, prosecuting, told the court that police estimated the cannabis, which was found by police during a raid on an address in Spring Gardens, Grantham, to have a value of £950,000.
The court also heard that Le is in breach of a deportation having been deported from the UK following criminal proceedings in 2009.
Magistrates agreed with the prosecution that the case is too serious to be heard at magistrates court so the case was sent to the crown court.
Giles Tyas, defending, made no application for bail so the men were remanded in custody.
A date for commital was set for March 18 but both men will next appear at court via video link on February 13.