In a statement, the farm said it had contacted all 20 of the retailers selling its produce.
“The advice to our customers remains to recall potentially contaminated spinach products from their shelves and to advise their own customers to do the same,” they said.
“Riviera Farms has been working with retailers and regulators to identify, and recall, potentially contaminated spinach products from shelves.”
While investigations are ongoing, it’s likely the spinach became contaminated by a toxic weed, such as a nightshade, jimson weed or mandrake root.
The weed may have contaminated the spinach crop as a result of recent flooding.
Assistant Health Minister Ged Kearey said Food Standards Australia New Zealand were investigating.
“I urge anyone feeling unwell who may have eaten affected products to seek medical care immediately and contact the Poisons Information Centre on 13 11 26,” she said.
“We are communicating frequently with the regulators as they continue their investigations. All appropriate measures necessary to keep people safe will continue to be taken.”