While a white rose has been the symbol of Yorkshire for over 600 years, yellow is synonymous with the cycling contest.
The Royal Horticultural Society is working with Welcome to Yorkshire, the agency which led the successful bid to bring the Tour de France to Yorkshire.
The groups have produced a factsheet detailing over 80 kinds of plants with yellow flowers or foliage – including four varieties of yellow rose.
It also contains tips on how to maintain yellow blooms, so the county is in full yellow bloom on 5-6 July 2014, when the Tour de France is due to race through the region.
RHS director of education, funding and communities Ruth Evans said gardeners could “make Yorkshire glow a gorgeous yellow while the world’s spotlight is on it”.
To download the yellow plant factsheet, visit www.rhs.org.uk/RHSyorkshireTDF