The United States has formally signed its participation contract for the International Horticultural Exhibition Yokohama 2027 (GREEN×EXPO 2027), which will take place from 19 March to 26 September 2027 in Yokohama, Japan. It is the first G7 nation to confirm involvement in the AIPH-approved A1 Exhibition.
The International Association of Horticultural Producers (AIPH) welcomes the confirmation that the United States will participate in International Horticultural Exhibition Yokohama 2027 (GREEN×EXPO 2027), to be held 19 March–26 September 2027 in Yokohama, Japan.
The participation contract was signed on 14 January 2026 by Mr KOMURA Masato, Secretary General of the Association for the 2027 International Horticultural Expo, and Mr Thomas E. Austin, Architect of the Capitol, who will serve as Commissioner of Section for the United States. Ambassador Mr KOSHIKAWA Kazuhiko, Commissioner of the Exhibition, countersigned the contract.
As an A1 International Horticultural Exhibition, the highest category under AIPH approval and BIE recognition, GREEN×EXPO 2027 is a significant global platform for international cooperation through horticulture. The United States’ participation reflects the growing international momentum behind the Exhibition. It reinforces its role as a meeting point for governments, institutions, and communities united by the power of plants.
The Exhibition will take place across approximately 100 hectares in the City of Yokohama and is expected to welcome 15 million visitors, including more than 10 million paying admissions. Under the theme “Scenery of the Future for Happiness,” GREEN×EXPO 2027 will present a shared vision of a sustainable, happy future shaped by horticulture.
U.S. participation will be led by the United States Botanic Garden (USBG), the oldest continuously operating public garden in the United States, established by Congress in 1820, and will be under the purview of the Architect of the Capitol.
The initiative will be delivered with the cooperation of the American Public Gardens Association (APGA), which advances public gardens as global leaders in plant conservation, education, and appreciation.
Mrs Mary Glass will serve as Commissioner General of the U.S. Exhibit, drawing on her experience in horticulture and landscape design to showcase the diversity, innovation, and leadership of American public gardens.
The U.S. exhibit will carry the theme “The Pursuit of Happiness,” combining the unique diversity of American plants and public gardens to connect visitors across cultures and generations. The theme reflects the Exhibition’s overarching vision.
The Exhibition site, located on the grounds of the former U.S. Navy Kamiseya Communication Facility, highlights the longstanding relationship between Japan and the United States.
Tim Briercliffe, Secretary General of AIPH, said:
“International Horticultural Exhibitions demonstrate how horticulture connects nations, strengthens collaboration, and inspires future generations. The participation of the United States as the first G7 nation to sign for GREEN×EXPO 2027 reflects the importance of these global platforms in bringing countries together through shared environmental ambition and cultural exchange. We look forward to seeing how the United States will interpret the Exhibition’s vision of a sustainable and happy future.”
As the approving body for A1 International Horticultural Exhibitions, AIPH – The World’s Champion for the Power of Plants – works closely with organisers and participating governments to ensure these global events demonstrate the essential value of horticulture in enriching lives, strengthening economies, and building more resilient environments worldwide.
