Links

Canada:

Devonian Botanic Garden
Dr. Sun Yat-Sen Classical Chinese Garden
The Butchart Gardens

Danmark: 

Botanisk Have, Aarhus
Den Gamle By i Aarhus
Den Jyske Rosenpark
Egeskov Slot
Gavnø Slot & Park
Geografisk Have i Kolding
Hedelund Rhododendronpark
Københavns Universitets Botaniske Have
Landbohøjskolens Have på Frederiksberg

England:

Borde Hill Garden, Park & Woodland
National Botanic Garden of Wales
Royal Botanic Gardens, Kew
Sir Harold Hillier Gardens, Hampshire
The Birmingham Botanical Gardens & Glasshouses
University of Durham Botanic Garden
Alpine Garden Society
The Scottish Rock Garden Club
The Scottish Rock Garden Club Forum

Estland:

Tallinn Botanic Garden

Finland:

Helsingfors

Holland:

Botanical Garden of Nijmegen

Norge:

Arktisk-alpin Botanisk hage, Tromsø i Norge
Botanisk Hage, Oslo

Sverige:

Bergianska Trädgården, Stockholm
Botaniska Trädgården, Uppsala 
Göteborgs Botaniska Trädgård
Sofiero Slott & slotshave, Helsingborg

Sydafrika:

National Botanical Garden, Cape Town - South Africa

Tyskland:

University of Bonn Botanical Gardens 

USA:

Bellingrath - Gardens and Home
Berkshire Botanical Garden
Birmingham Botanical Gardens 
Boxerwood Gardens
Brooklyn Botanic Garden
Cedar Valley Arboretum & Botanic Gardens
Chanticleer
Chicago Botanic Garden
Cleveland Botanical Garden
Desert Botanical Garden
Longwood Gardens
Matthaei Botanical Gardens
Missouri Botanical Garden
Strybing Arboretum & Botanical Gardens
The Dothan Area Botanical Gardens
The New York Botanical Garden