Ms Armiger had back problems which meant a lot of the tasks were difficult for her.
"I have never met such an amazing group of people. Nine out of 10 people would've stopped work as soon as the rain started - this group didn't. I'm absolutely in awe."
Later in the day, Ms Armiger took to Facebook to express her gratitude:
"I am absolutely blown away by all the wonderful people who came today... My garden looks like a show home and the whole place is beautiful."
Ms Mitchell, who had a young family, said it was in her nature to help out wherever she could.
"It's especially good to see this in Tiki... Where it's kind of known for home invasions, burglaries, domestic violence, that kind of thing. This just shows another side," Ms Mitchell said.
Garry Hazleton, who is looking for fulltime work - "you don't ask, you don't get" - said he was happy to give up his day to help. "I just didn't like what happened and I thought, bugger that!" he said.
Another man, Khan, who did not want his surname used, had come all the way from Dargaville to help.
Ms Mitchell had started a Facebook page "Help Me Help You", an informal environment where people could offer up their time or request help if they needed it.