According to NTS chairman Sir Kenneth Calman:
"Just two years ago, there was dismay at the possibility that this beautiful place would close to the public forever.
"In that short time, we have turned the fortunes of the secret garden around. We have cut its losses by thousands and raised enough money to ensure that it is well on the way to becoming self-sufficient.
"This demonstrates our new strategy well - we are not out to sell off our heritage gems, we are searching for new, innovative ways to make them work.
"The prospects for Arduaine Garden are rosy, and we'll be applying the lessons we've learned here to many of our other places over the next five years."
The garden, noted for its exotic planting, has worked with the neighbouring Loch Melfort Hotel on joint marketing initiatives, while a 200-strong Arduaine Garden Support Group has helped with publicity and provision of volunteers.
Annual running costs at the garden have been cut by £30,000.