International Hardy Plant Union
Servatiusstraße 53
D 53175 Bonn

Telephone: +49 228 81002 51
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.

read more


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.

read more


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.

read more

Recent news

18 Feb / 2021

Good response from the ISU Expert Talks

10 Mar / 2020

13th International Perennial Plant Conference more international than ever before

20 Feb / 2019

Gerben Tjeerdsma is the new coordinator

ISU - International Hardy Plant Union | Imprint | Data Protection Policy | Contact