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

25 Feb / 2016

Plant treasures in nature, for gardens and the urban environment

A record number of participants at the ISU International Perennial Plant Conference in Grünberg

06 Oct / 2015

50 years of International Hardy Plant Union:

A passion for plants and active perennial enthusiasts

06 Oct / 2015

ISU means to me...

Members talk about their relation to the ISU

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