Green-fingered volunteers planted 5,000 crocuses in Grenfell Park on Saturday.
Members of the Rotary Club of Maidenhead Bridge planted the purple flowers to raise awareness of the international Rotary campaign Purple 4 Polio.
The colour represents the purple dye put on the finger of vaccinated children during polio immunisation days.
The campaign hopes covering parks in the flower will symbolise a 'splash of hope' given to children who get the polio vaccination.
The group hopes the crocuses, which were planted to spell out the word Rotary, will flower around World Polio Day on April 24.
The club will be able to admire the plants at its annual Easter Family Fun Day, held at the park.
Lisa Hunter from the club said: "Luckily the weather was good so we managed to plant all 5,000 bulbs in the morning.
"There were only nine of us in total so it was quite a surprise to get that much done."
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