"Flowers of Flanders", unveiled by the island's Governor Sir Peter Walker, includes birdsfoot trefoil, germander speedwell and the famous red poppies - Papaver rhoeus - species that were all growing in Flanders 100 years ago.
British Wild Flower Plants owner and managing director Linda Laxton, who supplied the 1,000 plants and seeds needed for the display, began sowing last September.
"Nigel Clarke of Queux Patio Plant Centre and his team who have created the display will be able to renew the plants throughout the season, provided we keep him well stocked," she said. "Annuals are tricky as they are prone to rush off to seed if the weather's hot."
Loafers Wall will host "Flowers of Flanders" until 2018 as a reminder that the war lasted four years. Laxton said she hopes that Guernsey will have its own wild flower seed bank in the future.