Australia’s largest medicinal marijuana farm will be built in the outskirts of Toowoomba.

Construction on the facility will begin within the next six months; the completed farm is expected to produce 500 tonnes of marijuana per year.

The facility’s $400 million construction plans have been fast tracked by up to two years thanks to the merger of Australian-owned Australian Natural Therapeutics Group and Canadian-owned Asterion Cannabis Inc.

The facility will be close to Toowoomba's Wellcamp Airport, helping to facilitate a predicted $1 billion in exports per annum.