A man walking his dog through a park in the southern Oregon community of Rogue River discovered a portable toilet filled with marijuana plants, police said.

The man, who had stopped to use the toilet, found eight stalks of the freshly cut plants as tall as six feet high inside the stall while walking through Anna Classick Park just before 9am on Wednesday.

The Rogue River Police Department posted a photo on social media, saying it is the largest seizure of pot the department has ever made.

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Marijuana plants were found inside this portable toilet in the southern Oregon community of Rogue River on Wednesday morning

Police in the southern Oregon community of Rogue River say a man walking through a park discovered a portable toilet filled with marijuana plants

'We've never seized that much,' Chief Ken Lewis told The Mail Tribune.

'Who would have thought it would come from a porta-potty?'

Lewis said he did not weigh the plants but noted some of the stalks were four-inches wide and were loaded with marijuana buds.

A public works employee had checked the toilet three hours before the discovery was made at 8.55am and said it was empty, according to Lewis.

People playing tennis on a nearby court said they saw nothing suspicious.

The agency posted a photo on social media on Wednesday saying it is the largest seizure of pot the department has ever made

The man found eight stalks of the freshly cut plants as tall as six feet high inside the stall

On Thursday, Lewis said police still do not know how the pot got inside the portable toilet.

He said it could be anything from a pick up point to a disgruntled citizen making a statement about all the marijuana grows.

For now, they are not sure what they are going to do with the marijuana.

'It's too much to put in our evidence room and it's really stinking up the place, but that's tomorrow's problem,' Lewis told The Mail Tribune.

Marijuana grows are common in southern Oregon, which has some of the nation's best conditions for outdoor cultivation.

On Facebook, the agency said a man walking his dog through Anna Classick Park discovered the marijuana just before 9am