The Open Gardens SA Team

The South Australian program continues to bloom – and we look forward to many more successful years to come. We would like to thank all of our inspiring garden owners and those who continue to visit the gardens. Open Gardens SA is a not-for-profit organisation overseen by a dedicated committee of South Australian garden lovers, including designers, horticulturalists, garden owners, and several former committee members of the National Open Gardens body that ran for 25 years.

Rob Andrewartha


Rob was our Inaugral Treasurer and became Chairperson in 2018. Rob is the driving force behind the financial success of Open Gardens SA and brings years of financial management in the wine industry to the organisation. Rob is also the co-owner of The Garden in Wilpena Street, a beautiful garden in Eden Hills which makes a regular appearance in the spring program. Rob also plays in integral in role in presenting the Theatre in the Garden series.

David Hancock


After a career in the business services sector David embraced a ‘leaf change’ and studied Garden Design and Horticulture. He has been involved with Open Gardens in South Australia since 2009 as a selector and as a member and chair of the Regional Committee of Open Gardens Australia. David is a Foundation Member of OGSA and is the resident ‘stats’ man. He also has a keen interest in getting the best photographs to showcase our wonderful gardens.


Jane Knowler

Membership Secretary and Public Officer

Jane is an academic lawyer who was able to assist OGSA to incorporate as a not-for-profit organisation. She is also a very keen, albeit amateur, gardener who is learning more about gardening every day from tending her own garden in the Adelaide Hills and believes that community-based organisations bring great value to society.

Virginia Sheridan

Committee Member and joint Chair of Selectors

Virginia was heavily involved with the former Open Gardens Australia organisation from 2006 as a selector, committee member and was the Chair of Selectors for many years. Virginia has opened her garden "Silverwood" on 3 occasions with OGA. Virginia joined Open Gardens SA as a Foundation Member in 2015. She is interested in anything and everything associated with gardens and gardening. Virginia is also a member of the events committee.

Marg Wilkinson

Committee Member

Marg is a keen gardener and her garden "Gable Ends" was opened in Open Gardens Australia scheme in 2012 and Open Garden SA scheme in 2015. She is also a Foundation Member of Open Gardens Australia and heads up the organisation's amazing events committee which regularly caters for OGSA events.


 Trevor Nottle

Media Contributor

Trevor is a retired TAFE manager at Urrbrae and a well- known garden writer and garden historian with experiences as a speaker in many countries. He is a passionate plantsman and raises many plants from seed - especially those from Mediterranean climate zones including many bulbs. He is a volunteer at Carrick Hill and also serves on the committee of the SA branch of the Mediterranean Garden Society. Trevor was a Foundation Member of Open Gardens South Australia when it formed in 2015. Image courtesy SAGardens & Outdoor Living 2015


Lyn Edwards

Committee Member

Lyn has opened her garden “The Chestnuts” regularly since 1996 under the National Scheme and then with OGSA. She has been a Botanic Garden Guide in the Mount Lofty and Adelaide Botanic Gardens for two years and a volunteer gardener in “Hands on Hort” at the Mount Lofty Botanic Gardens. Lyn was a Selector for OGSA in 2017 and joined the Committee in 2018.

Dianne Michalk

Committee Member and Media Officer

Di is a very keen gardener and has been a member of Open Gardens South Australia since it formed in 2015.  Di has a wealth of experience in preparing and opening gardens and has been opening her garden, Ashgrove Iris Garden, to the public annually since 2000.  Di’s passion for gardening was acknowledged by being named as the ABC Gardening Australia’s “Gardener of the Year 2013”.

Fiona Watson

Committee Member

Fiona Watson was previously on the Open Gardens Australia committee for many years before becoming a Foundation and Committee Member for OGSA in 2015. She enjoys being involved with so many wonderfully inspirational people, members and gardens and also loves getting stuck into her own garden whenever she can. Fiona has previously opened her garden in Wayville.

Tom Wilkinson

Committee Member and Web Manager

Tom was formative in setting up our Incorporation and Rules. He developed our website which he continues to manage. Tom assisted his wife Marg in opening their garden Gable Ends on two occasions but his heart really belongs to his vineyard in the Adelaide Hills. Tom is frequently seen running the bar at OGSA events.

Victoria Winnall

Committee Member

Victoria Winnall was a much-loved and respected chairperson of the original Open Gardens Scheme for many years – probably more than she can count! She has been a committee member, selector and garden owner and brings years of gardening knowledge to the new organisation. Vick is a Foundation Member and was our Inaugral Chairperson.


Sonia Green

Admin Officer

Sonia Green has loved visiting beautiful gardens all her life and has been lucky enough to enjoy many, awe-inspiring gardens in Australia and Europe (especially Italy and France). She has relished dozens of outings to lovely gardens in Adelaide - probably since the original OGA was first established. Sonia has a background in journalism, communications and marketing,


Jamie McIlwain

Committee Member

Jamie is a Landscape Designer who leads teams of Horticulturalists in the Adelaide Hills. His company has won numerous (MLSA) Awards of Excellence for Design, Construction and Maintenance. Jamie is a founding Committee Member for the SA Landscape Festival and the OGSA Harvest Garden Festival. He brings to our Committee over 30 years of Garden Design and Landscaping knowledge.


Rory McGregor

Committee Member

Rory is the CEO of a company that makes software for the international film industry. He is also an enthusiastic gardener with a qualification in Garden Design and has an interest in mediterranean climate plants. His Strathalbyn property Brae Gairden has previously opened with OGSA.