![People walk in a field of fireweed, or Kochia scoparia, at the Hitachi Seaside Park in Hitachinaka, Japan, Oct. 22, 2018. Fireweed is a grass bush that takes on a bright red color in autumn. (Photo/Agencies)](http://www.ecns.cn/hd/2018/10/23/1aca5d983ddb49ae846b93102fb46ed0.jpg)
People walk in a field of fireweed, or Kochia scoparia, at the Hitachi Seaside Park in Hitachinaka, Japan, Oct. 22, 2018. Fireweed is a grass bush that takes on a bright red color in autumn. (Photo/Agencies)
![People walk in a field of fireweed, or Kochia scoparia, at the Hitachi Seaside Park in Hitachinaka, Japan, Oct. 22, 2018. Fireweed is a grass bush that takes on a bright red color in autumn. (Photo/Agencies)](http://www.ecns.cn/hd/2018/10/23/1275801e4a6446aeb2e91ebcaa69ccb7.jpg)
People walk in a field of fireweed, or Kochia scoparia, at the Hitachi Seaside Park in Hitachinaka, Japan, Oct. 22, 2018. Fireweed is a grass bush that takes on a bright red color in autumn. (Photo/Agencies)
![A couple take a picture in a field of fireweed, or Kochia scoparia, at the Hitachi Seaside Park in Hitachinaka, Japan, Oct. 22, 2018. Fireweed is a grass bush that takes on a bright red color in autumn. (Photo/Agencies)](http://www.ecns.cn/hd/2018/10/23/52d2bd88d92f4c3e8d8cb9cf29581ce0.jpg)
A couple take a picture in a field of fireweed, or Kochia scoparia, at the Hitachi Seaside Park in Hitachinaka, Japan, Oct. 22, 2018. Fireweed is a grass bush that takes on a bright red color in autumn. (Photo/Agencies)
![A couple take a picture in a field of fireweed, or Kochia scoparia, at the Hitachi Seaside Park in Hitachinaka, Japan, Oct. 22, 2018. Fireweed is a grass bush that takes on a bright red color in autumn. (Photo/Agencies)](http://www.ecns.cn/hd/2018/10/23/3d63e13cb23b45a88fc4f92569af7324.jpg)
A couple take a picture in a field of fireweed, or Kochia scoparia, at the Hitachi Seaside Park in Hitachinaka, Japan, Oct. 22, 2018. Fireweed is a grass bush that takes on a bright red color in autumn. (Photo/Agencies)
![A couple take a picture in a field of fireweed, or Kochia scoparia, at the Hitachi Seaside Park in Hitachinaka, Japan, Oct. 22, 2018. Fireweed is a grass bush that takes on a bright red color in autumn. (Photo/Agencies)](http://www.ecns.cn/hd/2018/10/23/86d599f3714d41ee9075e353025c74b1.jpg)
A couple take a picture in a field of fireweed, or Kochia scoparia, at the Hitachi Seaside Park in Hitachinaka, Japan, Oct. 22, 2018. Fireweed is a grass bush that takes on a bright red color in autumn. (Photo/Agencies)
![People walk in a field of fireweed, or Kochia scoparia, at the Hitachi Seaside Park in Hitachinaka, Japan, Oct. 22, 2018. Fireweed is a grass bush that takes on a bright red color in autumn. (Photo/Agencies)](http://www.ecns.cn/hd/2018/10/23/f7ba0328d15c48798b3bb4bfef000530.jpg)
People walk in a field of fireweed, or Kochia scoparia, at the Hitachi Seaside Park in Hitachinaka, Japan, Oct. 22, 2018. Fireweed is a grass bush that takes on a bright red color in autumn. (Photo/Agencies)