Islington 

• Culpeper Community Garden

• King Henry’s Walk Garden

• The Olden Community Garden

• Octopus Community Plant Nursery

• Sunnyside Community Gardens

• Duncan Terrace Gardens

• N1 Garden Centre

• Islington Council Green Spaces

• Canonbury Square

• Advice on Tree Pits in Islington

Beyond Islington

• De Beauvoir Gardeners

• Hampstead Heath 

• Royal Parks

• National Park City

• London Parks and Gardens Trust

• Boma Garden Centre

• Camden Garden Centre

• CPRE - London

• Tender Shoots Garden Club

• London Wildlife Trust

• The Garden Museum

• Kew Gardens

Further afield 

• Garden History Society

• Plant Heritage

• RHS

• National Garden Scheme : Mostly private gardens which open for charity donations

• Woodland Trust

• National Trust

• English Heritage