The owner of the land where a cannabis crop worth more than $20 million was uncovered was unaware his property was being used to grow the drugs.

Police found a large-scale bush crop, containing more than 8,000 plants, in the mountains of Calen, in Central Queensland, on Wednesday.

They say it has a street value of $20,222,500.

Two men from Bucasia have been charged and police allege they were cultivating cannabis crops in four large areas.

The 37-year-old and 71-year-old were charged with one count each of producing dangerous drugs.

They are due to face court in Mackay on Thursday.

Police say the property owner had no idea the crop was on his land.

Detective Inspector Bruce Duck says the property is rented out.

"There's no information, that we've got, that the owner of the property and the two persons that have been charged are linked at all," Duck said.