People walk in a field of fireweed, or Kochia scoparia, at the Hitachi Seaside Park in Hitachinaka, Japan, October 22, 2018. Fireweed is a grass bush that takes on a bright red colour in autumn. REUTERS/Toru Hanai TPX IMAGES OF THE DAY 

A couple take a picture in a field of fireweed, or Kochia scoparia, at the Hitachi Seaside Park in Hitachinaka, Japan, October 22, 2018. Fireweed is a grass bush that takes on a bright red colour in autumn. REUTERS/Toru Hanai 

A couple look at a picture in a field of fireweed, or Kochia scoparia, at the Hitachi Seaside Park in Hitachinaka, Japan, October 22, 2018. Fireweed is a grass bush that takes on a bright red colour in autumn. REUTERS/Toru Hanai 

People walk in a field of fireweed, or Kochia scoparia, at the Hitachi Seaside Park in Hitachinaka, Japan, October 22, 2018. Fireweed is a grass bush that takes on a bright red colour in autumn. REUTERS/Toru Hanai 

People walk in a field of fireweed, or Kochia scoparia, at the Hitachi Seaside Park in Hitachinaka, Japan, October 22, 2018. Fireweed is a grass bush that takes on a bright red colour in autumn. REUTERS/Toru Hanai 

A couple takes a picture in a field of fireweed, or Kochia scoparia, at the Hitachi Seaside Park in Hitachinaka, Japan, October 22, 2018. Fireweed is a grass bush that takes on a bright red colour in autumn. REUTERS/Toru Hanai 

A couple takes a picture in a field of fireweed, or Kochia scoparia, at the Hitachi Seaside Park in Hitachinaka, Japan, October 22, 2018. Fireweed is a grass bush that takes on a bright red colour in autumn. REUTERS/Toru Hanai 

A woman stands in a field of fireweed, or Kochia scoparia, at the Hitachi Seaside Park in Hitachinaka, Japan, October 22, 2018. Fireweed is a grass bush that takes on a bright red colour in autumn. REUTERS/Toru Hanai 

People walk in a field of fireweed, or Kochia scoparia and Cosmos, at the Hitachi Seaside Park in Hitachinaka, Japan, October 22, 2018. Fireweed is a grass bush that takes on a bright red colour in autumn. REUTERS/Toru Hanai 

A woman takes a picture in a field of Cosmos sulphureus at the Hitachi Seaside Park in Hitachinaka, Japan, October 22, 2018. Fireweed is a grass bush that takes on a bright red colour in autumn. REUTERS/Toru Hanai 

Fireweed flowers, also known as Ivan-chai (Ivan-tea), are seen in the Taiga area outside the Siberian village of Kazachinskoye, north of Krasnoyarsk, Russia July 11, 2016. Picture taken July 11, 2016. REUTERS/Ilya Naymushin 

Fireweed flowers, also known as Ivan-chai (Ivan-tea), are seen in the Taiga area outside the Siberian village of Kazachinskoye north of Krasnoyarsk, Russia, July 11, 2016. Picture taken July 11, 2016. REUTERS/Ilya Naymushin 

People walk in a field of fireweed, or Kochia scoparia, on a sunny autumn day at the Hitachi Seaside Park in Hitachinaka, north of Tokyo, October 26, 2015. Fireweed is a grass bush that takes on a bright red colour in autumn. REUTERS/Thomas Peter 

A child runs in a field of fireweed, or Kochia scoparia, on a sunny autumn day at the Hitachi Seaside Park in Hitachinaka, north of Tokyo, October 26, 2015. Fireweed is a grass bush that takes on a bright red colour in autumn. REUTERS/Thomas Peter 

A man walks in a field of fireweed, or Kochia scoparia, on a sunny autumn day at the Hitachi Seaside Park in Hitachinaka, north of Tokyo, October 26, 2015. Fireweed is a grass bush that takes on a bright red colour in autumn. REUTERS/Thomas Peter 

A woman walks in a field of fireweed, or Kochia scoparia, on a sunny autumn day at the Hitachi Seaside Park in Hitachinaka, north of Tokyo, October 26, 2015. Fireweed is a grass bush that takes on a bright red colour in autumn. REUTERS/Thomas Peter 

A couple walk in a field of fireweed, or Kochia scoparia, on a sunny autumn day at the Hitachi Seaside Park in Hitachinaka, north of Tokyo, October 26, 2015. Fireweed is a grass bush that takes on a bright red colour in autumn. REUTERS/Thomas Peter 

A woman holds a parasol as she stands in a field of fireweed, or Kochia scoparia, on a sunny autumn day at the Hitachi Seaside Park in Hitachinaka, north of Tokyo, October 26, 2015. Fireweed is a grass bush that takes on a bright red colour in autumn. REUTERS/Thomas Peter TPX IMAGES OF THE DAY