Police have seized almost half a million dollars in cash and heroin worth $1.4 million in a series of raids in Brisbane and the Sunshine Coast.

Police have seized almost half a million dollars in cash and heroin worth $1.4 million in a series of raids in Brisbane and the Sunshine Coast.

The raids also netted 349 ecstasy tablets, and $100,000 worth of jewellery, three sports cars and a street bike.

Three men and six women, including a defacto couple, have been charged over the raids.

The cash haul included $254,000 in cash that was buried in a suburban Brisbane backyard. A sniffer dog led officers to the stash.

Detective Superintendent Jon Wacker says the haul of heroin is one of the biggest in Brisbane in recent years.

“Heroin has not been vastly available in recent years,” he told reporters in Brisbane on Friday.

“A seizure of 3.4kg is a fairly unique seizure.”

Police raided four homes and one business in the Brisbane suburbs of Oxley, Sunnybank Hills, Ferny Grove and Calamvale, as well as Caloundra on the Sunshine Coast.

Det Wacker says police found $44,000 in the bedroom of the Oxley home, while a counterfeit sniffing dog uncovered $254,000 buried underneath an ornamental plant in two sealed bags.

They also found 3.34kg of heroin powder and seized two cars, a motorbike and jewellery at the home, he said.

“We will be alleging that the cash, the fairly modern motor vehicles and extravagant jewellery are all proceeds of crime,” Det Wacker said.

The nine people have been charged with a total of 14 drug possession and production offences.

The three men were kept in police custody overnight and are due to appear in the Brisbane Magistrates Court on Friday.

Police are still investigating and say more charges may be laid.