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

20 Feb / 2019

Personnel change at the ISU Winter Days 2019

Gerben Tjeerdsma is the new coordinator

28 Aug / 2018

Perennial gardeners confident despite heatwave

International communication at Summer Days 2018 in Poland

28 Aug / 2018

ISU Committee for Plant Analysis presents awards to 10 new perennials in Poland

The 121 new plants that had been excellently cared for at the Wojsławice Arboretum impressed the International Hardy Plant Union

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