Police have shut down a major marijuana growing operation in Calgary’s Harvest Hills neighbourhood.

Plants and equipment in the grow-op was valued at over $900,000 when it was busted on Feb. 25, the Alberta Law Enforcement Response Teams (ALERT) said in a written release.

Two women, aged 49 and 50, were arrested and face charges of production and possession of marijuana for the purpose of trafficking.

ALERT’s Green Team South, an integrated unit made up Calgary Police Service and RCMP officers, found 743 plants on the main floor of the northeast house, which was solely being used for marijuana production, police said.

“Based on the presence of mould in the home, it would appear this grow-op has been in operation for some time,” said Sgt. Len Dalton.

“People underestimate the damage grow-ops can do to a home. Besides mould, there are fire risks, electrical issues, and crime-related violence.”

The team has dismantled more than 50 grow-ops in southern Alberta and seized more than $20 million worth of marijuana plants since last April.