Visitors view flowers at the International Floriculture and Horticulture Trade Fair in Vijfhuizen, the Netherlands, Nov. 8, 2019. Over 2,200 exhibitors from all over the world presented their services for horticulture and flowers at the fair. (Photos: Sylvia Lederer/Xinhua)

A visitor takes a picture of flowers at the International Floriculture and Horticulture Trade Fair in Vijfhuizen, the Netherlands, Nov. 8, 2019. Over 2,200 exhibitors from all over the world presented their services for horticulture and flowers at the fair.

A visitor sits in an arrangement of flowers at the International Floriculture and Horticulture Trade Fair in Vijfhuizen, the Netherlands, Nov. 8, 2019. Over 2,200 exhibitors from all over the world presented their services for horticulture and flowers at the fair.

Flowers are seen at the International Floriculture and Horticulture Trade Fair in Vijfhuizen, the Netherlands, Nov. 8, 2019. Over 2,200 exhibitors from all over the world presented their services for horticulture and flowers at the fair.

Visitors view flowers at the International Floriculture and Horticulture Trade Fair in Vijfhuizen, the Netherlands, Nov. 8, 2019. Over 2,200 exhibitors from all over the world presented their services for horticulture and flowers at the fair.

Visitors attend the International Floriculture and Horticulture Trade Fair in Vijfhuizen, the Netherlands, Nov. 8, 2019. Over 2,200 exhibitors from all over the world presented their services for horticulture and flowers at the fair.

Visitors view flowers at the International Floriculture and Horticulture Trade Fair in Vijfhuizen, the Netherlands, Nov. 8, 2019. Over 2,200 exhibitors from all over the world presented their services for horticulture and flowers at the fair. (Photo by Sylvia Lederer/Xinhua)

Visitors attend the International Floriculture and Horticulture Trade Fair in Vijfhuizen, the Netherlands, Nov. 8, 2019. Over 2,200 exhibitors from all over the world presented their services for horticulture and flowers at the fair. (Photo by Sylvia Lederer/Xinhua)

A visitor views flowers at the International Floriculture and Horticulture Trade Fair in Vijfhuizen, the Netherlands, Nov. 8, 2019. Over 2,200 exhibitors from all over the world presented their services for horticulture and flowers at the fair. (Photo by Sylvia Lederer/Xinhua)

Flowers are seen at the International Floriculture and Horticulture Trade Fair in Vijfhuizen, the Netherlands, Nov. 8, 2019. Over 2,200 exhibitors from all over the world presented their services for horticulture and flowers at the fair. (Photo by Sylvia Lederer/Xinhua)