The photograph was seen around the world: US President Donald Trump and France's Emmanuel Macron, gilded spades in hand, shovelling dirt over a young sapling.
A week ago, at the beginning of Mr Macron's visit to Washington, the French president joined his American counterpart to throw handfuls of soil on the roots of a young oak tree as the their respective first ladies looked on
100 years ago, American soldiers fought in France, in Belleau to defend our freedom. This oak tree (my gift to @realDonaldTrump) will be a reminder at the White House of these ties that bind us. pic.twitter.com/AUdVncaKRN
— Emmanuel Macron (@EmmanuelMacron) April 24, 2018
It was a symbolic gesture: the tree came from a northern French forest where 2,000 US Marines died during the First World War.
But a few days later, the plant was nowhere to be seen.
Amid fervent speculation, France came through with an explanation: the tree, now not just a plant but a symbol of US-French relations, had been placed in quarantine.
"It is a quarantine which is mandatory for any living organism imported into the US," Gerard Araud, French ambassador to America, wrote on Twitter.
"It will be replanted afterwards."
When a follower fired back that the caution seemed a bit late, given that the tree had already been planted, the diplomat went on to confirm that the roots had been enclosed in plastic.