A woman accused of three murders by serving a toxic mushroom dish has admitted she foraged for the fungi and enjoyed eating them as "they taste good and they're very healthy".

"The first time I noticed them, I remember it was the dog eating some," Erin Patterson, 50, told a Supreme Court jury on Tuesday, about finding wild mushrooms growing at her property.

"I picked all the mushrooms that I could see. I was trying to figure out what they were to see if they were a problem for him."

During her second day in the witness box in Morwell, in regional Victoria, Patterson admitted she developed an interest in picking wild mushrooms in early 2020, during the first COVID-19 pandemic lockdown.

She said when Victorians were allowed outside for an hour a day she would "force the children" to get away from their devices.

"For an hour or so, we would go to Korumburra Gardens for the rail trail and I first noticed them popping up then," she said.

"Have you always liked eating mushrooms?" her defence barrister Colin Mandy SC asked.

"Yeah, I had. They taste good and they're very healthy," Patterson said.

She said she would buy "all the different types that Woolies would sell" and would also purchase mushrooms from local farmers' markets and grocers.

"I'd use them in curries, or pasta dishes, or soup, spaghetti," Patterson said.

"They just taste more interesting. There's more flavour."

But she said she discovered it was hard to figure out "what a mushroom is" when she began picking them.

"One species I was particularly worried about, I believe they were called Inocybe," Patterson said.

She would use Facebook groups for mushroom lovers to identify different types, including ones she found on her three-acre property in Korumburra.

Asked by her barrister about the process of consuming wild mushrooms, she said over several months, she got to a point where she "was confident about what I thought they were".

"I cut a bit off one of the mushrooms, fried it up with some butter, ate it and then saw what happened," Patterson said.

"They tasted good and I didn't get sick."

Patterson and her children ate the wild mushrooms she picked, and she said she "chopped them up very, very small".

Patterson has pleaded not guilty to three counts of murder over the deaths of Don and Gail Patterson and Gail's sister Heather Wilkinson after serving them a toxic beef in Wellington in July 2023.

The trial continues.

With AAP.