This Saturday, April 28, 2018, photo shows an empty area where a tree was planted by President Donald Trump and French President Emmanuel Macron during a tree planting ceremony is seen through the media... (Associated Press) 
 
 This Saturday, April 28, 2018, photo shows an empty area where a tree was planted by President Donald Trump and French President Emmanuel Macron during a tree planting ceremony is seen through the media van window on the South Lawn of the White House in Washington, Saturday, April 28, 2018. The young... (Associated Press) 
 
 PARIS (AP) — The French president's office says there's nothing mysterious about the disappearance of an oak tree he planted on the White House lawn. 
 
 It was put in quarantine, like other plants or animals brought into U.S. territory. 
 
 The sapling was a gift from French President Emmanuel Macron for his state visit to U.S. President Donald Trump last week. 
 
 An official in Macron's office said Monday that Trump insisted on holding a symbolic planting ceremony alongside Macron despite the quarantine requirement. The official said both sides knew all along that the tree would go later into quarantine. 
 
 A pale patch of grass now covers the spot. 
 
 The oak originally sprouted at the World War I Battle of Belleau Wood in northern France, where about 2,000 U.S. troops died fighting a German offensive. ||||| Remember the sapling that French President Emmanuel Macron gave to his American counterpart, Donald Trump, on his state visit last week? The one that, via a photo of the two presidents planting it, sparked much hilarity on social media? 
 
 Well, the sessile oak sapling—from Belleau, the French site of a World War I battle—is no longer on the White House lawn. 
 
 This fact was first flagged by a Reuters photographer, who noted on Saturday that there was now a piece of yellowed grass on the spot where the sapling stood just days ago. 
 
 For a while, the oak’s disappearance was a great mystery. But on Sunday, a perfectly reasonable explanation came to light. 
 
 According to Gérard Araud, the French ambassador to the U.S., the tree was placed into quarantine, and its photo-op planting had taken place with plastic around the sapling’s roots. 
 
 It is in quarantine which is mandatory for any living organism imported to the US. It will be replanted afterwards. https://t.co/XyJRKTgPWW — Gérard Araud (@GerardAraud) April 29, 2018 
 
 No. The roots were enclosed in a plastic protection. https://t.co/3HkZgl08m1 — Gérard Araud (@GerardAraud) April 29, 2018 
 
 U.S. Customs and Border Protection rules state that, when someone brings plants into the country with the intention of planting them, special restrictions may include “post-entry quarantine.” This measure is generally intended to mitigate the risk of spreading pests. 
 
 Many sessile oak trees in northern France are afflicted with a pest called the oak processionary moth, the habitat of which has been spreading north from Southern Europe in recent years, most likely due to climate change. The moth has reportedly not yet made it to the U.S., although it is becoming a problem in the South-East of England, thanks to someone importing live oaks that had eggs in them. 
 
 The Battle of Belleau Wood took place to the north-east of Paris in 1918, towards the end of the Great War. The U.S. Marine Corps took heavy casualties there, and Macron gave the sapling from the site as “a reminder at the White House of these ties that bind us.” 
 
 The new Sopranos season is the best pic.twitter.com/IAgj3gLvm3 — Mathieu von Rohr (@mathieuvonrohr) April 24, 2018 
 
 However, one particular shot of the planting ceremony, with Brigitte Macron and Melania Trump standing next to their husbands, briefly became something of a meme on Twitter.
– The French president's office says there's nothing mysterious about the disappearance of a sessile oak tree he planted on the White House lawn. It was put in quarantine, reports the AP, like other plants or animals brought into US territory. The sapling was a gift from French President Emmanuel Macron for his state visit to President Trump last week. An official in Macron's office said Monday that Trump insisted on holding a symbolic planting ceremony alongside Macron despite the quarantine requirement. The official said both sides knew all along that the tree would go later into quarantine. No word yet on when or where it might resurface. Fortune notes that US Customs and Border Protection regulations often mandate such quarantines to mitigate the risk of spreading pests; many sessile oaks in northern France have suffered from the spread of the oak processionary moth, which has not yet made it to the United States. The oak originally sprouted at the World War I Battle of Belleau Wood in northern France, where about 2,000 US troops died fighting a German offensive. A pale patch of grass now covers the spot where the presidents planted it.