A top secret lab in Slovenia is growing a cannabis crop researchers will use to test on patients here in Perth.

The plants are being turned into a mouth spray and could be the key to helping Australians suffering with dementia.

Researchers hope this spray is the answer to calming patients' agitation, aggression and could increase their appetite.

Carunya Care Services CEO Peter Basire knows the suffering dementia patients endure.

"There's pain management, there's behavioural issues. If they can alleviate any of those it'll be well worth doing."

"If the Perth researchers prove cannabis can help those with dementia, it'll be a global game changer.

“Around 50 million people on the planet have it - nearly half a million here in Australia.

“That number of Aussies is expected to double in the next 40 years."

Camera Icon The plants are being turned into a mouth spray and could be the key to helping Australians suffering with dementia. Credit: 7 News Perth

The University of Notre Dame's Institute for Health Research is now looking for candidates.

Professor Jim Codde, the director of the Institute for Health Research, believes the trial could prove a success.

"There is some evidence that supports that medical cannabis may be able to reduce those side effects of dementia."

Bicton grandmother Phyllis Grlusich is in the early stages of dementia and while she has always been anti-illicit drugs, the opportunity was too enticing, according to her son Wayne.

"She was pretty much up for it straight away and I think that's the thing,” he said.

“If we can help people down the track then it needs people like Mum."