From its foundation in 1804, the Royal Horticultural Society has grown to be the world’s leading horticultural organisation and the UK's leading gardening charity. Our four flagship gardens - Wisley in Surrey, Rosemoor in Devon, Hyde Hall in Essex and Harlow Carr in North Yorkshire - not only provide year-round interest but also demonstrate the best gardening practices, new techniques and exciting new plants to try in your garden.
http://www.rhs.org.uk

Kew Gardens is often referred to as the Royal Botanic Gardens. Three hundred acres containing collections of over 40,000 varieties of plants. Also seven glasshouses and two art galleries, Japanese and rock garden etc.
http://www.rbgkew.org.uk

Suttons Seeds is an internationally renowned supplier of flower and vegetable seeds, young plants, bulbs, fruit bushes and other horticultural products to amateur gardeners. We have a reputation for quality and service that is second to none, and a remarkable history that goes back almost two hundred years.
http://www.suttons-seeds.co.uk

The National Gardens Scheme has been opening fine gardens to the public to raise money for charity for over 75 years. Over 3,500 gardens now open in aid of the Scheme and its beneficary charities. Most gardens which open for the Scheme are privately owned and open just a few times each year.
http://www.ngs.org.uk