The nine-day celebration begins on October 29, featuring events split into the four categories of sustainability, arts, wellbeing and craft.
Many will be held on the St Enoch's Church lawn and various exhibitions will run throughout the festival.
Co-organiser Clair Higginson said the committee was in two minds about the festival's title now.
''Thyme is technically an invasive species. But it's a catchy name.''
Central Otago residents were becoming ''more and more'' environmentally conscious, she said.
With a concerted effort to re-introduce native species, the area could look ''very different'' in a few generations, she said. ''Central Otago actually used to be woodland.''
Co-organiser Beverley Thomson said the event attracted more people last year than the year before, and the committee hoped it would do the same this year thanks to new brochures and a greater social media presence.
''With some of the events this year we are trying to dig deeper. We've found people wanted to go more in-depth.''
One example was a two-day seed-collecting workshop in which participants will help secure the future of indigenous species.
This year more ''mindfulness'' events are included in the line-up, such as yoga and meditation, and more are targeted at children.
