The Hampton Court Palace Flower Show is the largest flower show in the world. The Show is held in early July, and run by the Royal Horticultural Society (RHS) at Hampton Court Palace in southwest London. The show features show gardens, floral marquees and pavilions, talks and demonstrations. Erected on the north and south sides of the Long Water in Hampton Court Park, it is the second major national show after the Chelsea Flower Show but has a different character, focusing more on environmental issues, growing your own food and vegetables and cookery, while also offering opportunities to buy gardening accessories, plants and flowers.
The Hampton Court Palace Flower Show was the brainchild of the management consultant Adrian Boyd, who saw an opportunity to connect two organisations facing times of uncertainty in a joint venture. The Department of the Environment had been dismembered in the 1980s, and one of the cuttings was Historic Royal Palaces, which found itself looking for ways of increasing revenue and attracting a larger audience. Similarly, Network Southeast, one of the temporary aggregations thrown up by the pre-privatisation of British Rail, was looking for ways of making its rail services more profitable. Boyd's idea was that Network Southeast should sponsor a flower show at Hampton Court, and provide the public transport to Hampton Court railway station. At the time the RHS Shows Department was working on four new events for 1993, in Birmingham, Harrogate, Wembley, and Glasgow.
In July 1990 the first Hampton Court Palace Flower Show was held. An effort was made to attract people to the show with special trains being laid from Waterloo Station, and porters wore carnations in their hats to create a buzz around the show. Even though there was comparatively little trade support for the show, it drew in large crowds. Network Southeast was pleased, saying "70 per cent of the estimated 300,000 visitors used rail and that has paid for our sponsorship many times over".
The RHS debated whether to offer to help with the show, especially when Chelsea reached full capacity. The organisers, after initial dismissal, indicated that they would welcome an RHS involvement from 1992, and RHS members were granted a reduced admission price at the 1991 show. Adrian Greenoak, the Show’s horticultural director, achieved a continuous improvement in the standards; the 1991 Show introduced a British Rose Festival, with the joint involvement of the Royal National Rose Society and the British Rose Growers’ Association.