Czech Rock Garden Society
Steingarten Gruppe Munchen
The Alpine Garden Club Of British Columbia
The Alpine Garden Society
The Cyclamen Society
The Dutch Rock Garden Society (NRV)
The Fritillaria Group
The international Clematis Society
The Meconopsis Group
The New Zealand Rock Garden Club
The North American Rock Garden Society
The Scottish Rock Garden Club
Vlaamse Rotsplanten Vereniging
