The Udon Thani International Horticultural Expo 2026 is ready to welcome visitors from Nov 1, with 20,000–30,000 expected daily. A bird's-eye view of the Udon Thani International Horticultural Expo 2026 venue, scheduled to run from Nov 1 to March 14 under the theme 'Diversity of Life: Connecting People, Water and Plants for Sustainable Living'.