Days after Canada's largest pot bust, police have seized nearly $1 million in marijuana plants in a raid on a London home on a quiet, rural street near Glanworth. City and RCMP officers swooped down on 6643 Fisher Lane Tuesday afternoon and found 914 pot plants inside.

A Kitchener man was arrested at the scene.

Police also searched an apartment building at 951 Wonderland Rd. S., seizing documentary evidence and charging a London man, said Const. Paul Martin.

Charged with unlawfully producing marijuana, possession for the purpose of trafficking and theft under $5,000 are Tang Van Bui, 54, of Kitchener and Minh Nghigm Pham, 30, of London.

With only three homes on Fisher Lane, neighbours are isolated, said Donna Merriam, who lives on the street.

She said she thought an older couple from the U.S. had bought but not yet moved into the home where the grow operation was busted.

"It had been empty for some time," she said, surprised to hear there was a grow operation next door.

"It's not something you think about. It's not something that even occurs to you."

Police began investigating the house in September, Martin said.

The drugs police seized have an estimated street value of $914,000.

Police said the home had a device that bypassed the electricity meter.

Grow operations require large amounts of power, so operators often try to tap unnoticed into power supplies.

The operation was larger than police typically see, Martin said.

"It's definitely on the high end of the scale, normally the average yield would be between $300,000 and $400,000," he said.

"When we look at the whole progress of operations, maybe $90,000 would be an average and certainly that has crept up over the last five years."

Martin said operations have become more elaborate.

At one time, grow operations would only use part of a house for marijuana production. But now, it's not uncommon for police to find whole houses converted into sophisticated operations.

The Fisher Lane home had been converted into a commercial operation, Martin said.

Barrie police uncovered Canada's largest known grow operation last Friday, seizing 30,000 pot plants from a former Molson brewery.

The sophisticated operation generated an estimated $100 million a year and went undetected for more than a year.

Police charged nine people, including a Corunna man, in the Barrie raid.