Crawley Borough Council hopes the town will come out in force on to help with its commemorative wildflower planting in the Memorial Gardens.
Volunteers are needed on Saturday April 5 to plant a mix of cornfield annuals and Flanders poppy seeds in the gardens to mark the centenary of the start of World War One.
Named The Heroes Walk, the floral tribute will border the main pathway leading from Queensway up to County Mall.
A council spokesman said: “Poppies will only flower for around six weeks, so we are adding an annual variety to the mix to extend the season and make the flowering even more intense.”
Cllr Nigel Boxall, Cabinet member for community engagement, added: “We’re hoping community groups, schools and families will join together to help honour the 100th anniversary of WW1.
“We have sown wild flowers in the Memorial Gardens a number of times and, on each occasion, have received only positive comments.”
Free seeds will also be available for volunteers to sow at home themselves over the next few weeks, ready to flower this summer and in time for the anniversary.
The seeds can also be sown in window boxes, pots on balconies or windowsills.
Any leftover seeds will be available to the public on a first come, first served basis from the town hall and will be communicated via social media.
Those interested in volunteering should arrive at the Memorial Gardens at 10am.