A farmer near Riding Mountain National Park called police to report strange weeds growing in his oat crop last week.

When RCMP arrived Saturday, they realized he'd been all too right.

They seized 146 marijuana plants almost ready to be harvested.

The plants had been spread out amongst the oats over an area of about 20 acres.

The farmer's oat crop was not damaged.

RCMP have not laid any charges. The investigation continues.