More than 90,000 was raised for the Southern Highlands Botanic Gardens, which is the biggest success yet for organisers.

Organiser Peter Scott said organisers were overwhelmed by the thousands of visitors and final total which was "beyond expectations".

"It was a fantastic success," Mr Scott said.

"I think having the plant sale at the Southern Highlands Botanic Garden helped - there was a lot of passing traffic which made it visible,"

"We had a queue of people at 8.45am ready for the sale at 9am."

Mr Scott said organisers were also overwhelmed by the positive feedback they received.

"We had a lot of good feedback from visitors," Mr Scott said.

"It was suggested that we do it in Spring since it was so popular."

Mr Scott said the Southern Highlands had a strong reputation for its gardens which was a contributing factor in its success,

"The Southern Highlands is well-known as a garden area," he said.

"The weekend was a great chance for people to see six well-established gardens."

"We're going to have a debriefing to see how we can take the event forward for next year."

Six gardens were showcased including Greenbrier Park in Mittagong, The Garden House in Burradoo, Sutton Tops in Sutton Forest, Whare-Tau in Exeter, Arden in Bundanoon and Eastdene in Bundanoon.

Visitors were impressed by the range at the plant sale which included rare and hard to find plants such as albucas, correas, crambes, franklinias and kniphofias.

In addition to Highlands visitors, people came from both out-of-town and interstate from areas including Western Australia, Tasmania, Young, Canberra and Goulburn.

This brought tourism to the area with many families staying in local accommodation and visiting local restaurants and shops over the two-day event.

Funds raised for the Southern Highlands Botanic Gardens will be put into a bank account to contribute to the major building project.

The Southern Highlands Botanic Gardens already has several donation collections in place and working bees planned for every month.

When further developed the gardens will educate the general public about horticulture and landscaping, plants and biological communities and raise community awareness about biodiversity and plant conservation.

Mr Scott encourages those who would like to get involved with the event next year to get in contact with him.

To express your interest, call Peter Scott on 0427 240 246.