Construction for the world’s largest medicinal cannabis facility is due to begin in Toowoomba in August.

Built 250 metres from the Wellcamp International Airport, it will cost $400 million, producing 500 tonnes of cannabis per year and employing about 1000 people.

Demand for medicinal cannabis is set to soar, with prescriptions tripling in Australia over the last year and low-dose CBD oil soon to be sold at pharmacies without prescription.

Toowoomba Mayor Paul Antonio says the economic boost to the region will be tremendous.