The RHS is producing a factsheet to help gardeners plant yellow flowers to commemorate the Tour de France when it comes to Yorkshire on 5-6 July 2014.
The fact sheet produced in conjunction with tourism body Welcome to Yorkshire contains 80 different kinds of plants with yellow flowers or yellow foliage, tips on when to plant them, and how to maintain them.
The yellow theme links to the famous Tour de France leader's yellow jersey.
Welcome to Yorkshire chief executive Gary Verity said: "The Grand Départ provides Yorkshire with a unique opportunity to showcase what the county has to offer and highlight the pride we have in our towns and villages. We understand the economic advantages of attractive places and with the help of the RHS we want to enhance the county, creating show stopping floral displays that will wow the crowds next summer.
The Grand Départ of the Tour de France takes place in Yorkshire on the weekend of the 5th and the 6th July.
The first stage races from Leeds to Harrogate via the Yorkshire Dales and the second stage races from York to Sheffield via Pennine Yorkshire.
More details about the Grand Départ are available online at www.letouryorkshire.com.