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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

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.

24 Feb / 2025

The International Hardy Plant Union is professionalising itself and its image. After years of discussion, the board, which has been newly formed since August, has commissioned a logo and corresponding templates for its media and presented them for the first time at the ISU-Winter Days in Grünberg in mid-February.

26 Aug / 2024

29 perennial novelties were entered for the International Hardy Plant-Union (ISU) trial in Angers. 25 could be evaluated, reported Jonas Bengtsson, President of the ISU Trial Commission at the meeting on August 11 in Angers.

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