International Horticultural Expos are a type of International Exhibitions and they are held under the joint auspices of the BIE and the AIPH (the International Association of Horticultural Producers).

The Horticultural Expos are recognized by the BIE after the following steps are taken: the project is examined and approved by the AIPH; the government of the country in which the exhibition would be held submits a request for recognition to the BIE, and the BIE General Assembly approves the project’s general regulations.

• These events can last a minimum of 3 months and a maximum of 6 months and can take place every 2 years in different countries, and once a decade in the same country
• The size of the site must be over 50 hectares