Two medicinal marijuana companies have fast-tracked plans to build a large cannabis farm in the conservative heartland of Queensland.

Construction of the facility on the outskirts of Toowoomba is set to begin within six months and will produce 500 tonnes of marijuana a year with an export value of more than $1 billion.

A merger of Australian-owned Australian Natural Therapeutics Group (ANTG) and Canadian-owned Asterion Cannabis Inc has hastened construction plans by up to two years, according to ANTG chief executive Matt Cantelo.

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