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International Hardy Plant Union
Servatiusstraße 53
D 53175 Bonn

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

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.

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.

26 Aug 2024

The International Perennial Union offered the almost 60 participants of the Summer Days from August 11-15 in Angers, France, a very diverse program. Perennial experts from 12 European countries and the USA met there from variously structured companies and enjoyed the professional exchange as well as the typical local culture.

26 Aug 2024

The board of the International Perennial Union (ISU) is now younger and more female following the regular re-election. ISU-Chairman Aad Vollebregt from the Netherlands did not stand for re-election after 12 years, as did Beate Zillmer from Germany and Michel Le Damany from France.

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