Royal Horticultural Society (RHS). The official site of Britain's main gardening society and charity.
Professional Gardeners' Guild (PGG). The guild represents Head Gardeners, Garden Managers, assistant gardeners, self-employed gardeners and trainee gardeners mainly in historic, heritage or botanic sites.
The Society of Garden Designers (SGD). A professional society for UK based garden designers.
Arboricultural Association. Dedicated to the advice and care of trees.
CBS Power Tools sell a range of electric, cordless and petrol driven garden machinery and accessories.
What Can I Plant Now? - List of plants that can been sown each month.