Six countries from the Americas have confirmed participation in GREEN×EXPO 2027: the United States, Ecuador, Colombia, Bolivia, Panama and Haiti. This is based on the participation list published by the GREEN×EXPO Association (as of 9 September 2026) and the Ministry of Foreign Affairs list (as of 7 September 2026). Colombia was newly added in the 9 September 2026 list. Three of the six, the United States, Bolivia and Panama, have gone on to sign an official participation contract with the Association.
GREEN×EXPO 2027 is the 2027 International Horticultural Expo. It will run from 19 March to 26 September 2027 at a site in Yokohama’s Seya and Asahi wards. The tables below give each country’s official participation contract status and the capital, population and language from the Ministry of Foreign Affairs’ basic data, current as of September 2026. Only the United States’ exhibit direction is known; the other five have no exhibit information as of September 2026.
North America
| Country | Official participation contract | Capital | Population | Language |
|---|---|---|---|---|
| The United States | Signed, effective 14 Jan 2026 (announced 6 Feb 2026; first G7 country to sign) | Washington, D.C. | about 342.35 million (February 2026, US Census Bureau estimate) | Chiefly English |
The United States Botanic Garden (USBG), which comes under the Architect of the Capitol, leads the exhibit with cooperation from the American Public Gardens Association (APGA). The theme is “The Pursuit of Happiness.” We also cover the United States in a dedicated article, currently available in Japanese only.
Central America and the Caribbean
| Country | Official participation contract | Capital | Population | Language |
|---|---|---|---|---|
| Panama | Signed 28 May 2026 (announced 14 Jul 2026) | Panama City | about 4.51 million (2024, World Bank) | Spanish |
| Haiti | Not signed as of September 2026 | Port-au-Prince | 11.58 million (2022, World Bank) | French and Haitian Creole (both official) |
Japan is one of the Panama Canal’s principal users, and about 60% of Japanese-owned ships are registered under the Panamanian flag (Ministry of Foreign Affairs basic data). In 2020 OECD/DAC statistics, Japan was Panama’s largest bilateral donor.
Following the 2010 Haiti earthquake, Japan deployed Self-Defense Forces engineering units to the UN peacekeeping mission there from February 2010 to December 2012, and through March 2019 provided more than 320 million dollars in reconstruction and development support (Ministry of Foreign Affairs basic data).
South America
| Country | Official participation contract | Capital | Population | Language |
|---|---|---|---|---|
| Ecuador | Not signed as of September 2026 | Quito | 18.28 million (2025, World Bank) | Spanish (along with Kichwa, Shuar and others) |
| Colombia | Not signed as of September 2026 (newly added to the participation list dated 9 September 2026) | Bogotá | 53.42 million (2025, World Bank) | Spanish |
| Bolivia | Signed 23 May 2026 (announced 23 Jun 2026) | La Paz (Sucre is the constitutional capital) | 12.58 million (2025, World Bank) | Spanish along with 36 Indigenous languages centred on Quechua and Aymara |
President Rodrigo Paz of Bolivia, who took office in November 2025, has pledged to improve relations with the United States and other advanced economies (Ministry of Foreign Affairs basic data).
For the other participating countries and organisations, see our participating countries guide. Dates, getting there, tickets and where to stay are on our GREEN×EXPO 2027 page.