"People come to look at the garden and the setting. We love sharing our garden and I love meeting the visitors. [The garden] is beautiful, how could we not share it?"
Her 7-year-old grandson, Quin Fenwick, was one of many volunteers helping out, but Mrs La Grouw said he was not big enough yet to help with the gardening.
"When he's older I'll show him the difference between a weed and a plant."
Quin said he had been having fun and was growing his own vegetable garden at home "with heaps of broccoli".
Kawaha Point resident Carol Robertson had walked to the event from her home.
"I love it. I came along as it's a voluntary fundraiser. It's my first time ... I do potter around in my own garden but it's nothing like this."
Local Sarah Fornasiere, who had come along with her family, said it had been a nice day out.
"We came along because we like art and gardens. It's my first time."
New to the event this year was an art exhibition by local artists, with artwork displayed in the garage.
Six pieces sold, Mrs La Grouw said.
Nine Rotorua sculptors had work on display, made out of stone and wood.
All proceeds raised from the event go towards operational costs for the Geyser Community Foundation.
She said the organisation was chosen as her husband had been the founding chairman.
The purpose of the Geyser Community Foundation is to promote and support charitable giving towards local community organisations and charitable purposes.
Volunteer Sandy Hall said Mr and Mrs La Grouw had the "most beautiful garden".
"They've put in decades of work."