Lytham in Lancashire has won the "ultimate community gardening prize" at the Britain In Bloom awards.
Lytham won a gold and was named the Champion of Champions by the RHS in the ceremony in Cleethorpes.
The RHS said Lytham was "the cleanest, greenest and most beautiful location in Britain".
Roger Burnett, chair of the RHS Britain in Bloom judging panel, said of Lytham: "It was a true pleasure to visit such wonderful places and meet inspirational people."
Stephen Hall, designer of the floral display in Lytham, said the success was down to "everyone coming together. You can't put a value on it; it brings so many people to the town."
More than 1,000 communities entered the 2013 Britain in Bloom awards.
Chef Raymond Blanc called on communities to grow their own fresh produce as part of ‘Edible Britain', the theme of RHS Britain in Bloom 2013, in which 1,000 mini allotments were set up in public spaces across the UK including inner-city London, Manchester, Glasgow and Newcastle.
Bath received the ‘Edible Britain' award for embracing the campaign across the city. Woolton (Liverpool) impressed judges with their allotments and won the Urban Community category.
Blanc said: "Many children in Britain are going to school hungry because their families can't afford to buy supermarket food. This is happening when there are public spaces that aren't being used in cities and towns around Britain.
"There are great examples by RHS Britain in Bloom groups like 2013 finalist The Meadows in Nottingham - residents took charge of a fly-tipping site and turned it into an organic farm which serves 7,000 local people in the area.
"They are growing delicious fresh fruit and vegetables with no chemicals or energy being wasted on transportation, people are eating healthily and children are learning about the origins of their food."
Some 77 RHS Britain in Bloom 2013 finalists celebrated their results in Cleethorpes. There are more than 3,300 Britain in Bloom groups who look after an estimated two million acres of public space.
See full winners' list here.