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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.

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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.

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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.

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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.

16 Dec / 2025
Job advertisement

Job advertisement: Management for the ISU

The ISU is looking for a part-time Managing Director (approx. 100-140 hours/year) to start as soon as possible. Working closely with the ISU Secretary, the Managing Director will manage membership, coordinate events, and support the ongoing development of the ISU and its committes.

Download: Job advertisement

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).

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