Britain's Catherine, Duchess of Cambridge, speaks with people during a visit to LEYF (London Early Years Foundation) Stockwell Gardens Nursery & Pre-school in London, Britain January 29, 2020. Phil Harris/Pool via REUTERS 

Britain's Catherine, Duchess of Cambridge, visits the LEYF (London Early Years Foundation) Stockwell Gardens Nursery & Pre-school in London, Britain January 29, 2020. Phil Harris/Pool via REUTERS 

Britain's Catherine, Duchess of Cambridge arrives at LEYF (London Early Years Foundation) Stockwell Gardens Nursery & Pre-school in London, Britain January 29, 2020. REUTERS/Simon Dawson 

Britain's Catherine, Duchess of Cambridge arrives at LEYF (London Early Years Foundation) Stockwell Gardens Nursery & Pre-school in London, Britain January 29, 2020. REUTERS/Simon Dawson 

Britain's Catherine, Duchess of Cambridge arrives at LEYF (London Early Years Foundation) Stockwell Gardens Nursery & Pre-school in London, Britain January 29, 2020. REUTERS/Simon Dawson 

A passion fruit tree is pictured at the nursery of Kokkoya Organics, an urban organic farm in Yangon, Myanmar, May 4, 2019. REUTERS/Ann Wang 

Brigitte Macron, the wife of the French president, holds a pepper as she visits the garden of a nursery school on Goree island, once a west African slaving post, off the coast of Dakar, Senegal, February 2, 2018. REUTERS/Seyllou/Pool 

Brigitte Macron, the wife of the French president, holds a pepper as she visits the garden of a nursery school on Goree island, once a west African slaving post, off the coast of Dakar, Senegal, February 2, 2018. REUTERS/Seyllou/Pool 

A view of a nursery of tropical palms following a wild fire near Potrero, California, U.S. June 21, 2016. REUTERS/Mike Blake

A specialist from ICARDA, the International Center for Agricultural Research in the Dry Areas, inspects wheat inside a Syrian seed nursery in Tirbol village, Bekaa valley, Lebanon March 10, 2016. REUTERS/Mohamed Azakir 

Specialists from ICARDA, the International Center for Agricultural Research in the Dry Areas, inspect a Syrian seed nursery in Tirbol village, Bekaa valley, Lebanon March 10, 2016. REUTERS/Mohamed Azakir 

A nursery gardener holds Christmas trees painted with the blue, white, red colors of the French flag, in Rungis International food market as buyers prepare for the Christmas holiday season in Rungis, south of Paris, December 11, 2015. REUTERS/Philippe Wojazer TPX IMAGES OF THE DAY 

Belgian girl Lola, 6, looks at Xing Hui, a giant Panda, at the Pairi Daiza wildlife park in Brugelette, September 6, 2015. Lola has been living in Pairi Daiza since she was born. Her father Koen Vanderschueren, who currently works as the zoo's deputy-manager, arrived in the park when it opened 19 years ago. Her mother Tania works as a zookeeper specialising in pandas and the nursery. Picture taken September 6, 2015. REUTERS/Yves Herman 

Belgian girl Lola, 6, looks at baby Hyenas at the Pairi Daiza wildlife park in Brugelette, September 6, 2015. Lola has been living in Pairi Daiza since she was born. Her father Koen Vanderschueren, who currently works as the zoo's deputy-manager, arrived in the park when it opened 19 years ago. Her mother Tania works as a zookeeper specialising in pandas and the nursery. Picture taken September 6, 2015. REUTERS/Yves Herman 

Belgian girl Lola, 6, looks at a baby secretary bird at the Pairi Daiza wildlife park in Brugelette, September 6, 2015. Lola has been living in Pairi Daiza since she was born. Her father Koen Vanderschueren, who currently works as the zoo's deputy-manager, arrived in the park when it opened 19 years ago. Her mother Tania works as a zookeeper specialising in pandas and the nursery. Picture taken September 6, 2015. REUTERS/Yves Herman 

Belgian girl Lola, 6, gestures in front of elephants at the Pairi Daiza wildlife park in Brugelette, September 6, 2015. Lola has been living in Pairi Daiza since she was born. Her father Koen Vanderschueren, who currently works as the zoo's deputy-manager, arrived in the park when it opened 19 years ago. Her mother Tania works as a zookeeper specialising in pandas and the nursery. Picture taken September 6, 2015. REUTERS/Yves Herman 

Belgian girl Lola, 6, gives apples to elephants at the Pairi Daiza wildlife park in Brugelette, September 6, 2015. Lola has been living in Pairi Daiza since she was born. Her father Koen Vanderschueren, who currently works as the zoo's deputy-manager, arrived in the park when it opened 19 years ago. Her mother Tania works as a zookeeper specialising in pandas and the nursery. Picture taken September 6, 2015. REUTERS/Yves Herman 

Belgian girl Lola, 6, walks next to Bob, a four-month-old moose, at the Pairi Daiza wildlife park in Brugelette, September 6, 2015. Lola has been living in Pairi Daiza since she was born. Her father Koen Vanderschueren, who currently works as the zoo's deputy-manager, arrived in the park when it opened 19 years ago. Her mother Tania works as a zookeeper specialising in pandas and the nursery. Picture taken September 6, 2015. REUTERS/Yves Herman 

A child plays in the garden of a kindergarten run by a private foundation which is not affected by the nursery caretakers' strike in Hanau, 30km south of Frankfurt, Germany, May 11, 2015. Most of the kindergartens run by public services all over Germany face a strike of the nursery caretakers as they fight for higher wages and better working conditions. REUTERS/Kai Pfaffenbach 

A child plays in the garden of a kindergarten run by a private foundation which is not affected by the nursery caretakers' strike in Hanau, 30km south of Frankfurt, Germany, May 11, 2015. Most of the kindergartens run by public services all over Germany face a strike of the nursery caretakers as they fight for higher wages and better working conditions. REUTERS/Kai Pfaffenbach 

A child plays in the garden of a kindergarten run by a private foundation which is not affected by the nursery caretakers' strike in Hanau, 30km south of Frankfurt, Germany, May 11, 2015. Most of the kindergartens run by public services all over Germany face a strike of the nursery caretakers as they fight for higher wages and better working conditions. REUTERS/Kai Pfaffenbach 

A child plays in the garden of a kindergarten run by a private foundation which is not affected by the nursery caretakers' strike in Hanau, 30km south of Frankfurt, Germany, May 11, 2015. Most of the kindergartens run by public services all over Germany face a strike of the nursery caretakers as they fight for higher wages and better working conditions. REUTERS/Kai Pfaffenbach 

A child plays in the garden of a kindergarten run by a private foundation which is not affected by the nursery caretakers' strike in Hanau, 30km south of Frankfurt, Germany, May 11, 2015. Most of the kindergartens run by public services all over Germany face a strike of the nursery caretakers as they fight for higher wages and better working conditions. REUTERS/Kai Pfaffenbach 

Children play in the garden of their kindergarten run by a private foundation which is not affected by the nursery caretakers' strike in Hanau, 30km south of Frankfurt, Germany, May 11, 2015. Most of the kindergartens run by public services all over Germany face a strike of the nursery caretakers as they fight for higher wages and better working conditions. REUTERS/Kai Pfaffenbach 

A child plays in the garden of a kindergarten run by a private foundation which is not affected by the nursery caretakers' strike in Hanau, 30km south of Frankfurt, Germany, May 11, 2015. Most of the kindergartens run by public services all over Germany face a strike of the nursery caretakers as they fight for higher wages and better working conditions. REUTERS/Kai Pfaffenbach 

Children play in the garden of their kindergarten run by a private foundation which is not affected by the nursery caretakers' strike in Hanau, 30km south of Frankfurt, Germany, May 11, 2015. Most of the kindergartens run by public services all over Germany face a strike of the nursery caretakers as they fight for higher wages and better working conditions. REUTERS/Kai Pfaffenbach 

A child plays in the garden of a kindergarten run by a private foundation which is not affected by the nursery caretakers' strike in Hanau, 30km south of Frankfurt, Germany, May 11, 2015. Most of the kindergartens run by public services all over Germany face a strike of the nursery caretakers as they fight for higher wages and better working conditions. REUTERS/Kai Pfaffenbach 

Children play in the garden of their kindergarten run by a private foundation which is not affected by the nursery caretakers' strike in Hanau, 30km south of Frankfurt, Germany, May 11, 2015. Most of the kindergartens run by public services all over Germany face a strike of the nursery caretakers as they fight for higher wages and better working conditions. REUTERS/Kai Pfaffenbach 

Children play in the garden of their kindergarten run by a private foundation which is not affected by the nursery caretakers' strike in Hanau, 30km south of Frankfurt, Germany, May 11, 2015. Most of the kindergartens run by public services all over Germany face a strike of the nursery caretakers as they fight for higher wages and better working conditions. REUTERS/Kai Pfaffenbach 

Children play in the garden of their kindergarten run by a private foundation which is not affected by the nursery caretakers' strike in Hanau, 30km south of Frankfurt, Germany, May 11, 2015. Most of the kindergartens run by public services all over Germany face a strike of the nursery caretakers as they fight for higher wages and better working conditions. REUTERS/Kai Pfaffenbach 

Children play in the garden of their kindergarten run by a private foundation which is not affected by the nursery caretakers' strike in Hanau, 30km south of Frankfurt, Germany, May 11, 2015. Most of the kindergartens run by public services all over Germany face a strike of the nursery caretakers as they fight for higher wages and better working conditions. REUTERS/Kai Pfaffenbach 

Children play in the garden of their kindergarten run by a private foundation which is not affected by the nursery caretakers' strike in Hanau, 30km south of Frankfurt, Germany, May 11, 2015. Most of the kindergartens run by public services all over Germany face a strike of the nursery caretakers as they fight for higher wages and better working conditions. REUTERS/Kai Pfaffenbach 

Children play in the garden of their kindergarten run by a private foundation which is not affected by the nursery caretakers' strike in Hanau, 30km south of Frankfurt, Germany, May 8, 2015. Most of the kindergartens run by public services all over Germany face a strike of the nursery caretakers as they fight for higher wages and better working conditions. REUTERS/Kai Pfaffenbach 

Children play in the garden of their kindergarten run by a private foundation which is not affected by the nursery caretakers' strike in Hanau, 30km south of Frankfurt, Germany, May 8, 2015. Most of the kindergartens run by public services all over Germany face a strike of the nursery caretakers as they fight for higher wages and better working conditions. REUTERS/Kai Pfaffenbach 

Children play in the garden of their kindergarten run by a private foundation which is not affected by the nursery caretakers' strike in Hanau, 30km south of Frankfurt, Germany, May 8, 2015. Most of the kindergartens run by public services all over Germany face a strike of the nursery caretakers as they fight for higher wages and better working conditions. REUTERS/Kai Pfaffenbach 

Children play in the garden of their kindergarten run by a private foundation which is not affected by the nursery caretakers' strike in Hanau, 30km south of Frankfurt, Germany, May 8, 2015. Most of the kindergartens run by public services all over Germany face a strike of the nursery caretakers as they fight for higher wages and better working conditions. REUTERS/Kai Pfaffenbach 

Children play in the garden of their kindergarten run by a private foundation which is not affected by the nursery caretakers' strike in Hanau, 30km south of Frankfurt, Germany, May 8, 2015. Most of the kindergartens run by public services all over Germany face a strike of the nursery caretakers as they fight for higher wages and better working conditions. REUTERS/Kai Pfaffenbach 

Children play in the garden of their kindergarten run by a private foundation which is not affected by the nursery caretakers' strike in Hanau, 30km south of Frankfurt, Germany, May 8, 2015. Most of the kindergartens run by public services all over Germany face a strike of the nursery caretakers as they fight for higher wages and better working conditions. REUTERS/Kai Pfaffenbach 

Recently planted orchids grow inside a carefully controlled lab at Fairchild Tropical Botanic Garden in Miami, Florida April 8, 2014. Inside a small bright lab, nestled behind sprawling Banyan trees in Miami's Fairchild Tropical Botanic Garden, scientists and volunteers tend to tens of thousands of just-germinated orchids tucked in glass bottles. Fifty thousand more with long verdant leaves wait in a nearby nursery. In the coming weeks, crews in bucket trucks, usually used to fix power lines, will lift the fragile plants onto trees that line south Florida's roads, hoping they will take root and re-establish the blanket of millions of brightly colored flowers that once covered the state. The effort to reintroduce millions of orchids in Miami was inspired by a similar undertaking in Singapore that began in the mid-1990s, said Carl Lewis, who leads the Million Orchid Project as director of the botanic garden. A handful of the Florida species that Fairchild scientists are hoping to repopulate grow in limited numbers at the garden. Picture taken April 8, 2014. REUTERS/Zachary Fagenson (UNITED STATES - Tags: ENVIRONMENT SCIENCE TECHNOLOGY) 

Volunteer Andrew Reeve removes and replants orchids that have grown too large for their existing cultivation bottles at Fairchild Tropical Botanic Garden in Miami, Florida April 8, 2014. Inside a small bright lab, nestled behind sprawling Banyan trees in Miami's Fairchild Tropical Botanic Garden, scientists and volunteers tend to tens of thousands of just-germinated orchids tucked in glass bottles. Fifty thousand more with long verdant leaves wait in a nearby nursery. In the coming weeks, crews in bucket trucks, usually used to fix power lines, will lift the fragile plants onto trees that line south Florida's roads, hoping they will take root and re-establish the blanket of millions of brightly colored flowers that once covered the state. The effort to reintroduce millions of orchids in Miami was inspired by a similar undertaking in Singapore that began in the mid-1990s, said Carl Lewis, who leads the Million Orchid Project as director of the botanic garden. A handful of the Florida species that Fairchild scientists are hoping to repopulate grow in limited numbers at the garden. Picture taken April 8, 2014. REUTERS/Zachary Fagenson (UNITED STATES - Tags: ENVIRONMENT SCIENCE TECHNOLOGY) 

Volunteer Mike Reeve prepares a new batch of bottles to be filled with orchid seeds at Fairchild Tropical Botanic Garden in Miami, Florida April 8, 2014. Inside a small bright lab, nestled behind sprawling Banyan trees in Miami's Fairchild Tropical Botanic Garden, scientists and volunteers tend to tens of thousands of just-germinated orchids tucked in glass bottles. Fifty thousand more with long verdant leaves wait in a nearby nursery. In the coming weeks, crews in bucket trucks, usually used to fix power lines, will lift the fragile plants onto trees that line south Florida's roads, hoping they will take root and re-establish the blanket of millions of brightly colored flowers that once covered the state. The effort to reintroduce millions of orchids in Miami was inspired by a similar undertaking in Singapore that began in the mid-1990s, said Carl Lewis, who leads the Million Orchid Project as director of the botanic garden. A handful of the Florida species that Fairchild scientists are hoping to repopulate grow in limited numbers at the garden. Picture taken April 8, 2014. REUTERS/Zachary Fagenson (UNITED STATES - Tags: ENVIRONMENT SCIENCE TECHNOLOGY) 

A Pine Pink Orchid (Bletia purpurea) is seen at Fairchild Tropical Botanic Garden in Miami, Florida April 8, 2014. Inside a small bright lab, nestled behind sprawling Banyan trees in Miami's Fairchild Tropical Botanic Garden, scientists and volunteers tend to tens of thousands of just-germinated orchids tucked in glass bottles. Fifty thousand more with long verdant leaves wait in a nearby nursery. In the coming weeks, crews in bucket trucks, usually used to fix power lines, will lift the fragile plants onto trees that line south Florida's roads, hoping they will take root and re-establish the blanket of millions of brightly colored flowers that once covered the state. The effort to reintroduce millions of orchids in Miami was inspired by a similar undertaking in Singapore that began in the mid-1990s, said Carl Lewis, who leads the Million Orchid Project as director of the botanic garden. A handful of the Florida species that Fairchild scientists are hoping to repopulate grow in limited numbers at the garden. Pine Pink Orchid is one of the species the garden hopes to repopulate in the wild. Picture taken April 8, 2014. REUTERS/Zachary Fagenson (UNITED STATES - Tags: ENVIRONMENT SCIENCE TECHNOLOGY) 

Cigar Orchids (Cyrtopodium punctatum) are seen at Fairchild Tropical Botanic Garden in Miami, Florida April 8, 2014. Inside a small bright lab, nestled behind sprawling Banyan trees in Miami's Fairchild Tropical Botanic Garden, scientists and volunteers tend to tens of thousands of just-germinated orchids tucked in glass bottles. Fifty thousand more with long verdant leaves wait in a nearby nursery. In the coming weeks, crews in bucket trucks, usually used to fix power lines, will lift the fragile plants onto trees that line south Florida's roads, hoping they will take root and re-establish the blanket of millions of brightly colored flowers that once covered the state. The effort to reintroduce millions of orchids in Miami was inspired by a similar undertaking in Singapore that began in the mid-1990s, said Carl Lewis, who leads the Million Orchid Project as director of the botanic garden. A handful of the Florida species that Fairchild scientists are hoping to repopulate grow in limited numbers at the garden. The Cigar Orchid is one of the species the garden hopes to repopulate in the wild. Picture taken April 8, 2014. REUTERS/Zachary Fagenson (UNITED STATES - Tags: ENVIRONMENT SCIENCE TECHNOLOGY) 

Five-year-old Atsunori Kaneta smiles at his home in Koriyama, west of the tsunami-crippled Fukushima Daiichi nuclear power plant, Fukushima prefecture February 28, 2014. March 11 marks the third anniversary of the earthquake and tsunami that devastated Japan's Fukushima Daiichi nuclear power plant. In Koriyama, a short drive from the crippled Fukushima nuclear plant, the city recommended shortly after the disaster that children up to two years old not spend more than 15 minutes outside each day. Those aged 3 to 5 should limit their outdoor time to 30 minutes or less. The limits were lifted last year, but many kindergartens and nursery schools continue to obey them even now in line with the wishes of worried parents. An annual survey by the Fukushima prefecture Board of Education found that children in Fukushima weighed more than the national average in virtually every age group. The cause seems to be a lack of exercise and outdoor activity. Picture taken February 28, 2014. REUTERS/Toru Hanai (JAPAN - Tags: DISASTER EDUCATION ENVIRONMENT HEALTH)

ATTENTION EDITORS: PICTURE 21 OF 22 FOR PACKAGE 'FUKUSHIMA - FIGHTING AN INVISIBLE ENEMY'. TO FIND ALL IMAGES SEARCH 'KORIYAMA HANAI' 

Two year-old Kaethe plays with paints in the garden of her home in Hanau, 30km (18 miles) south of Frankfurt, July 21, 2013. From August 1, 2013, all children in Germany between the age of 1 and 3 will have a legal entitlement to a place at a kindergarten. Picture taken July 21. REUTERS/Kai Pfaffenbach (GERMANY - Tags: POLITICS SOCIETY) 

Raymond Evison of the Guernsey clematis nursery inserts a name plate into a display during preparation for the Chelsea Flower Show in London May 17, 2013. REUTERS/Luke MacGregor (BRITAIN - Tags: ENVIRONMENT) 

A worker cleans a nursery on the outskirts of Cairo, April 1, 2013. REUTERS/Asmaa Waguih (EGYPT - Tags: AGRICULTURE SOCIETY) 

A worker collects flowers at a nursery on the outskirts of Cairo, April 1, 2013. REUTERS/Asmaa Waguih (EGYPT - Tags: AGRICULTURE SOCIETY) 

Gardener Sue Dale inspects poinsettia plants prior to their shipment from the Ravensworth nursery near Richmond, northern England November 13, 2012. The nursery has grown 18,000 plants which arrived in July as small plugs, and were placed in specialist greenhouses at a constant temperature of 20 degrees Celsius (68 degrees Fahrenheit). They are now due to be sent to markets and retailers across the country this week for Christmas. REUTERS/Nigel Roddis (BRITAIN - Tags: AGRICULTURE ANNIVERSARY ENVIRONMENT) 

Gardener Sue Dale inspects poinsettia plants prior to their shipment from the Ravensworth nursery near Richmond, northern England November 13, 2012. The nursery has grown 18,000 plants which arrived in July as small plugs, and were placed in specialist greenhouses at a constant temperature of 20 degrees Celsius (68 degrees Fahrenheit). They are now due to be sent to markets and retailers across the country this week for Christmas. REUTERS/Nigel Roddis (BRITAIN - Tags: AGRICULTURE ANNIVERSARY ENVIRONMENT) 

Gardener Sue Dale inspects poinsettia plants prior to their shipment from the Ravensworth nursery near Richmond, northern England November 13, 2012. The nursery has grown 18,000 plants which arrived in July as small plugs, and were placed in specialist greenhouses at a constant temperature of 20 degrees Celsius (68 degrees Fahrenheit). They are now due to be sent to markets and retailers across the country this week for Christmas. REUTERS/Nigel Roddis (BRITAIN - Tags: AGRICULTURE ANNIVERSARY ENVIRONMENT) 

Gardener Sue Dale inspects poinsettia plants prior to their shipment from the Ravensworth nursery near Richmond, northern England November 13, 2012. The nursery has grown 18,000 plants which arrived in July as small plugs, and were placed in specialist greenhouses at a constant temperature of 20 degrees Celsius (68 degrees Fahrenheit). They are now due to be sent to markets and retailers across the country this week for Christmas. REUTERS/Nigel Roddis (BRITAIN - Tags: AGRICULTURE ANNIVERSARY ENVIRONMENT) 

A man tends to saplings in clay pots at a nursery in Lahore November 16, 2011. REUTERS/Mohsin Raza (PAKISTAN - Tags: AGRICULTURE BUSINESS EMPLOYMENT) 

A man stands among palm seedlings grown in the Socfin Agricultural Company's nursery in Malen chiefdom in Pujehun district in southern Sierra Leone October 27, 2011. The Sierra Leone plantation of Lichtenstein-based Socfin is one of many such projects in Africa, spurred by global demand for food and biofuel but criticized by some as "land grabs". Police arrested 39 local people in last month's protests, and the row has become a political hot potato. Picture taken October 27, 2011. To match Feature SIERRALEONE-BIOFUELS/ REUTERS/Simon Akam (SIERRA LEONE - Tags: ENERGY ENVIRONMENT AGRICULTURE POLITICS BUSINESS) 

Dave Majerus (L), owner of Riverside Gardens nursery, and worker Willis Wager examine a levee protecting the business in Valley City, North Dakota April 14, 2011. Flooding was spreading out across broad stretches of rural North Dakota and Minnesota Wednesday with the latest threat along the Sheyenne River, which crested Thursday at near record levels. REUTERS/Eric Thayer (UNITED STATES - Tags: ENVIRONMENT) 

A man plants flower saplings in clay pots at a nursery in Lahore December 23, 2010. REUTERS/Mohsin Raza (PAKISTAN - Tags: AGRICULTURE BUSINESS SOCIETY) 

A tree that was uprooted rests on a bench in the garden of a nursery in the town of Muehlberg some 55 km (34 miles) northwest of Dresden, May 25, 2010. REUTERS/Thomas Peter (GERMANY - Tags: DISASTER) 

A toy lies next to an uprooted tree in the garden of a nursery after a cyclone swept through the town of Muehlberg some 55 km (34 miles) northwest of Dresden, May 25, 2010. REUTERS/Thomas Peter (GERMANY - Tags: DISASTER) 

A man waters the harvest in an urban garden in Havana August 11, 2009. Cuba's urban agriculture movement, developed in the 1990s as a response to the food crisis after the collapse of its former benefactor the Soviet Union, provides over 50 percent of the vegetables Cubans eat. REUTERS/Stringer(CUBA AGRICULTURE) 

A woman works in an urban garden in Havana August 11, 2009. Cuba's urban agriculture movement, developed in the 1990s as a response to the food crisis after the collapse of its former benefactor the Soviet Union, provides over 50 percent of the vegetables Cubans eat. REUTERS/Stringer(CUBA AGRICULTURE)