Flower imports to Japan were hampered by strict checks in which all flowers showing signs of disease or insects had to be smoked before entering.
另一方面，日本政府對外來農產品採取抵制態度，實行非常嚴格的「檢驗防疫」。只要發現花上有任何蟲或卵，不論日本本地的花卉是否有同種類的蟲、卵，整批花必須薰蒸，龐大的薰蒸費用，則由外國業者負擔。