International Hardy Plant Union
Godesberger Allee 142-148
D 53175 Bonn

Telephone: +49 228 81002 51
Fax: +49 228 81002 77
E-Mail: info@isu-perennials.org


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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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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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

21 Dec / 2020

“ISU Expert Talks” on February 13, 2021

Online meeting with Noel Kingsbury and Geir Moen

10 Mar / 2020

Near-natural garden and park design on trend globally

13th International Perennial Plant Conference more international than ever before

20 Feb / 2019

Personnel change at the ISU Winter Days 2019

Gerben Tjeerdsma is the new coordinator

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