"We checked on her everyday since she moved in six weeks ago and yesterday the eggs hatched," Joyce said.
"There were hundreds, at least two hundred ... we were incredibly excited. It's been a real hit with the neighbourhood kids. They love it. As soon as my four-year-old nephew comes here he says - 'I want to see the big spider lady'.
"And when I looked after friend's daughters, who are six and eight years old, they were so excited about the babies they made Hortense a little nursery, complete with a nappy changing table, cot and sofa."
To make sure everything went to plan Joyce contacted Museums Victoria for advice, and she was warned that the mother huntsman would be "extremely protective of her egg sac" and "will bite much more readily than at other times".
But in the end there was nothing to worry about as Hortense just positioned herself in the corner of the letterbox and even the postman didn't know she was there.
Joyce was also reassured that her garden was not going to overrun by giant hairy spiders, as of the hundreds that were born, only two or three of them would live to adulthood.