A man has allegedly sold drug-laced muffins to NSW high school students, causing two to be hospitalised.

The 19-year-old was arrested on Saturday following investigations which began when the Toronto students were taken to John Hunter Hospital after eating the cannabis-containing baked treats on Monday, police say.

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The alleged muffin supplier has been charged with one count of supplying prohibited drugs and is due to face Toronto Local Court on July 19.

It follows news that the country’s first medicinal cannabis farm has officially been opened at an undisclosed location near Tamworth in northern New South Wales.

MP Barnaby Joyce launched the 47-hectare property which has been named in honour of Dan Haslam, whose battle with cancer contributed to the push to legalise medicinal cannabis in Australia.

It comes just over a year after he died.