Harborough in Bloom volunteers helped the Rotary Club of Harborough by planting almost 5,000 crocus bulbs along the Millennium Mile near the town’s Memorial Gardens.
The purple flowers will bloom in February and bring an additional splash of colour to the popular route.
More bulbs are to be planted in beds near St Dionysius Church once the scaffold currently adorning the building is removed.
The colour purple was chosen by Rotary International to represent progress the organisation is making in its battle to eradicate polio worldwide.
Rotary, working with the World Health Organisation and the Bill and Melinda Gates Foundation, has funded the immunisation programme against polio for more than 30 years.
President of Harborough Rotary Club, Les Dodd, said: “It is important that Rotary International continues this campaign to end polio. We can enjoy the purple crocuses while thinking of those who continue to suffer the effects of polio because there was no vaccine.
“We are very grateful to the Harborough in Bloom volunteers for planting the crocuses for us.”
Children in countries all over the world have their little fingers dipped in purple paint to show they have been immunised with the two drops of vaccine. Immunisation is given by drops into the mouth and each dose costs 25p.