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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

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.

20 Jul / 2025

The second Future Days of the International Perennial Union (ISU) will take place in Langenlois near Vienna on October 9–10.

24 Feb / 2025

110 perennial gardeners and enthusiasts from 16 countries met in Grünberg from 14-16 February for the 17th time this year to exchange experiences and meet colleagues.

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