People wearing protective face masks walk past blossoming lilac trees as they visit a botanical garden following the easing of lockdown measures, which were imposed to curb the spread of the coronavirus disease (COVID-19), in Kiev, Ukraine May 18, 2020. REUTERS/Valentyn Ogirenko

Women take pictures in front of blossoming lilac trees as they visit a botanical garden following the easing of lockdown measures, which were imposed to curb the spread of the coronavirus disease (COVID-19), in Kiev, Ukraine May 18, 2020. REUTERS/Valentyn Ogirenko

People rest during "A week of lilac" in the botanical garden in Minsk, Belarus May 13, 2018. REUTERS/Vasily Fedosenko

People rest during "A week of lilac" in the botanical garden in Minsk, Belarus May 13, 2018. REUTERS/Vasily Fedosenko

A woman takes a selfie during "A week of lilac" in the botanical garden in Minsk, Belarus May 13, 2018. REUTERS/Vasily Fedosenko

A woman takes a selfie during "A week of lilac" in the botanical garden in Minsk, Belarus May 13, 2018. REUTERS/Vasily Fedosenko

A couple rests under lilac trees at a park in Kiev, Ukraine May 6, 2018. REUTERS/Valentyn Ogirenko

A couple shares a kiss among lilac trees at a park in Kiev, Ukraine May 6, 2018. REUTERS/Valentyn Ogirenko

Avocados at an avocado farm are shown damaged by the Lilac Fire, a fast moving wild fire in Bonsall, California, U.S., December 8, 2017. REUTERS/Mike Blake

Avocados at an avocado farm are shown damaged by the Lilac Fire, a fast moving wild fire in Bonsall, California, U.S., December 8, 2017. REUTERS/Mike Blake

A firefighter puts water on a hotspot caused by the Lilac Fire, a fast moving wildfire in Bonsall, California, U.S., December 8, 2017. REUTERS/Mike Blake

An U.S. military helicopter from Camp Pendleton makes a water drop on a hotspot caused by the Lilac Fire, a fast moving wildfire in Bonsall, California, U.S., December 8, 2017. REUTERS/Mike Blake

An U.S. military helicopter from Camp Pendleton makes a water drop on a hotspot caused by the Lilac Fire, a fast moving wildfire in Bonsall, California, U.S., December 8, 2017. REUTERS/Mike Blake

An U.S. military helicopter from Camp Pendleton makes a water drop on a hotspot caused by the Lilac Fire, a fast moving wild fire in Bonsall, California, U.S., December 8, 2017. REUTERS/Mike Blake

An U.S. military helicopter from Camp Pendleton makes a water drop as a firefighter puts out a hotspot at an avocado farm after the Lilac Fire, a fast moving wildfire in Bonsall, California, U.S., December 8, 2017. REUTERS/Mike Blake

A firefighter puts out a hotspot at an avocado farm after the Lilac Fire, a fast moving wildfire in Bonsall, California, U.S., December 8, 2017. REUTERS/Mike Blake

Burned mobile homes are seen at the Monserate Country Club after the Lilac Fire, a fast moving wildfire, swept through their community in Bonsall, California, U.S., December 8, 2017. REUTERS/Mike Blake

Burned mobile homes are seen at the Monserate Country Club after the Lilac Fire, a fast moving wildfire, swept through their community in Bonsall, California, U.S., December 8, 2017. REUTERS/Mike Blake

Burned mobile homes are seen at the Monserate Country Club after the Lilac Fire, a fast moving wildfire, swept through their community in Bonsall, California, U.S., December 8, 2017. REUTERS/Mike Blake

Firefighters keep watch for spot fires as winds calm and smoke lays low from the Lilac Fire, a fast moving wildfire in Bonsall, California, U.S., December 8, 2017. REUTERS/Mike Blake

Burned mobile homes are seen at the Monserate Country Club after the Lilac Fire, a fast moving wildfire, swept through their community in Bonsall, California, U.S., December 8, 2017. REUTERS/Mike Blake

Burned mobile homes are seen at the Monserate Country Club after the Lilac Fire, a fast moving wildfire, swept through their community in Bonsall, California, U.S., December 8, 2017. REUTERS/Mike Blake TPX IMAGES OF THE DAY

Burned mobile homes are seen at the Monserate Country Club after the Lilac Fire, a fast moving wildfire, swept through their community in Bonsall, California, U.S., December 8, 2017. REUTERS/Mike Blake

Burned mobile homes are seen at the Monserate Country Club after the Lilac Fire, a fast moving wildfire, swept through their community in Bonsall, California, U.S., December 8, 2017. REUTERS/Mike Blake

Firefighters pour water on a smouldering tree as calm winds are helping them to try to contain the Lilac Fire, a fast moving wild fire in Bonsall, California, U.S., December 8, 2017. REUTERS/Mike Blake

A firefighter pours water on a smouldering tree as calm winds are helping to try to contain the Lilac Fire, a fast moving wildfire in Bonsall, California, U.S., December 8, 2017. REUTERS/Mike Blake

A DC-10 aircraft turns past a fire truck after making a drop as firefighters take advantage of light winds to attack the Lilac Fire, a fast moving wild fire in Bonsall, California, U.S., December 8, 2017. REUTERS/Mike Blake

An aircraft drops fire retardant as firefighters take advantage of light winds to attack the Lilac Fire, a fast moving wild fire in Bonsall, California, U.S., December 8, 2017. REUTERS/Mike Blake TPX IMAGES OF THE DAY

A DC-10 aircraft drops fire retardant next to a house as firefighters take advantage of light winds to attack the Lilac Fire, a fast moving wild fire in Bonsall, California, U.S., December 8, 2017. REUTERS/Mike Blake

An aircraft drops fire retardant as firefighters take advantage of light winds to attack the Lilac Fire, a fast moving wild fire in Bonsall, California, U.S., December 8, 2017. REUTERS/Mike Blake

A DC-10 aircraft drops fire retardant next to a house as firefighters take advantage of light winds to attack the Lilac Fire, a fast moving wild fire in Bonsall, California, U.S., December 8, 2017. REUTERS/Mike Blake

A DC-10 aircraft drops fire retardant next to a house as firefighters take advantage of light winds to attack the Lilac Fire, a fast moving wild fire in Bonsall, California, U.S., December 8, 2017. REUTERS/Mike Blake

A firefighter works at the top of a hill as the Lilac Fire, a fast moving wild fire, burns through Bonsall, California, U.S., December 7, 2017. REUTERS/Mike Blake

Firefighters look out at the approaching flames from the Lilac Fire, a fast moving wild fire in Bonsall, California, U.S., December 7, 2017. REUTERS/Mike Blake

A car drives past a large wall of approaching flames from the Lilac Fire, a fast moving wild fire in Bonsall, California, U.S., December 7, 2017. REUTERS/Mike Blake

A police vehicle drives past flames from the Lilac Fire, a fast moving wild fire in Bonsall, California, U.S., December 7, 2017. REUTERS/Mike Blake

A fire truck drives towards approaching flames from the Lilac Fire, a fast moving wild fire in Bonsall, California, U.S., December 7, 2017. REUTERS/Mike Blake

A fire fighting helicopter makes a water drop on the Lilac Fire at night as the wild fire continues to burn in Bonsall, California, U.S., December 7, 2017. REUTERS/Mike Blake

Firefighters work at the top of a hill as the Lilac Fire burns through Bonsall, California, U.S., December 7, 2017. REUTERS/Mike Blake

A firefighter works structure production at the top of a hill as the Lilac Fire burns through Bonsall, California, U.S., December 7, 2017. REUTERS/Mike Blake

Fire fighting helicopters and water bomber douse the Lilac Fire as it burns through Bonsall, California, U.S., December 7, 2017. REUTERS/Mike Blake

A fire truck makes its way along a smoke filled road during the Lilac Fire in Bonsall, California, U.S., December 7, 2017. REUTERS/Mike Blake

A fire fighting helicopter travels over the Lilac Fire as evening comes to Bonsall, California, U.S., December 6, 2017. REUTERS/Mike Blake

A fire fighting helicopter flies over the Lilac Fire as evening comes to Bonsall, California, U.S., December 6, 2017. REUTERS/Mike Blake

A firefighter waits at the top of a hill to battle the Lilac Fire, a fast moving wild fire in Bonsall, California, U.S., December 7, 2017. REUTERS/Mike Blake

A firefighter works at the top of a hill as the Lilac Fire burns through Bonsall, California, U.S., December 7, 2017. REUTERS/Mike Blake

A firefighter works at the top of a hill as the Lilac Fire burns through Bonsall, California, U.S., December 7, 2017. REUTERS/Mike Blake

Trees glow in the wind after being burned in the Lilac Fire in Bonsall, California, U.S., December 7, 2017. REUTERS/Mike Blake

A firefighter works on structure production at the top of a hill as the Lilac Fire burns through Bonsall, California, U.S., December 7, 2017. REUTERS/Mike Blake

A horse is evacuated from the Lilac Fire, a fast moving wild fire in Bonsall, California, U.S., December 7, 2017. REUTERS/Mike Blake

A firefighter looks back as he prepares for structure protection of an large apartment complex at the top of a hill as Lilac Fire approaches in Bonsall, California, U.S., December 7, 2017. REUTERS/Mike Blake

A firefighter is working on extinguishing the Lilac Fire, a fast moving wildfire in Bonsall, California, U.S., December 7, 2017. REUTERS/Mike Blake

A firefighter is working on extinguishing the Lilac Fire, a fast moving wildfire in Bonsall, California, U.S., December 7, 2017. REUTERS/Mike Blake

A firefighter is working on extinguishing the Lilac Fire, a fast moving wildfire in Bonsall, California, U.S., December 7, 2017. REUTERS/Mike Blake

A firefighter is working on extinguishing the Lilac Fire, a fast moving wildfire in Bonsall, California, U.S., December 7, 2017. REUTERS/Mike Blake

A firefighter is working on extinguishing the Lilac Fire, a fast moving wildfire, in Bonsall, California, U.S., December 7, 2017. REUTERS/Mike Blake TPX IMAGES OF THE DAY

A firefighter is working on extinguishing the Lilac Fire, a fast moving wildfire in Bonsall, California, U.S., December 7, 2017. REUTERS/Mike Blake

A firefighter is working on extinguishing the Lilac Fire, a fast moving wildfire, in Bonsall, California, U.S., December 7, 2017. REUTERS/Mike Blake

The Lilac Fire, a fast moving wildfire, continues to burn in Bonsall, California, U.S., December 7, 2017. REUTERS/Mike Blake

A stucture burns in the Lilac Fire, a fast moving wildfire in Bonsall, California, U.S., December 7, 2017. REUTERS/Mike Blake