Acorns and chestnuts were collected from trees on the battlefield at Verdun and sent to England to be distributed and planted as war memorials.
Some were sold by the London and North Western Railway in 1917 to raise money for the War Seal Foundation, founded by Oswald Stoll.
Queen Mary planted a Verdun oak on the Sandringham Estate in Norfolk on 28 January 1920.
Two Verdun oaks were planted in the Royal Botanic Gardens, Kew on Peace Day, 19 July 1919; one remains, but the other was removed in 2014.
Some Verdun trees have been removed, including one at Upton Lawn, Cheshire and one at Moorcourt Estate, Pembridge.