ENGLISH

International Hardy Plant Union
Servatiusstraße 53
D 53175 Bonn

Telephone: +49 228 81002 51
E-Mail: info@isu-perennials.org

SUMMER DAYS

Every 2 year, we organise a Congress, now called 'the Summer Days', as a real meeting point for all colleagues. During these days the delegate – meeting takes place.

read more

WINTER DAYS

The aim of this conference is to promote international contacts in the Perennial Plant Industry and to provide an opportunity to exchange knowledge and expertise in an inspiring atmosphere.

read more

BOTANICAL EXCURSIONS

The excursions of the ISU have a long tradition. Since its foundation there have been several excursions. They either go to botanically interesting regions and give good inside view of our perennials in the wild.

read more

Recent news

23 Feb / 2026

The 18th edition of the International Perennial Plant Conference, "Winter Days," took place from February 13 to 15, 2026, in the picturesque town of Grünberg, Germany.

21 Nov / 2025

Climate change and design aspects are closely linked when it comes to the use of perennials. This became clear at the second Future Days of the International Perennial Union (ISU).

29 Aug / 2025

Every two years, the International Perennial Union (ISU) organizes exploratory tours for its members with renowned experts who are familiar with the region being visited, its flora, and hikes to sites of particular botanical interest.

ISU - International Perennial Society | Imprint | Data Protection Policy | Contact