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What kind of flower is this? The rhizome looks like ginger. Is it edible or medicinal?

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Clothing ginger is mainly used as fresh cut flowers, dried flowers and garden greening. The annual output of fresh cut flowers is as high as 15,000-20,000 branches per mu, and the vase period is long. Up to 15-20 days. Because of its unique shape of red leathery spikes, it is easy to make dried flowers and is a good dried flower material. Plant them in clusters in courtyards, parks, flower beds, etc. They will grow lush and green, and the flowers will stand tall and graceful. The plant can also be used as medicine. Source: Costus speciosus (Koenig) Smith, a plant of the genus Zingiberaceae, whose rhizome is used as medicine. It can be harvested in four seasons, preferably in late autumn, washed and sliced, steamed and dried in the sun. The nature and flavor are pungent, sour and slightly cold. A little poisonous. The roots are poisonous when fresh. Overeating can cause dizziness, vomiting, severe diarrhea, etc. Function: Diuresis and swelling, detoxification and itching. Used for whooping cough, nephritis and edema, urinary tract infection, liver cirrhosis, ascites, and dysuria; external use to treat urticaria, sores, boils, and otitis media. Usage: 2 to 5 qian; for external use, decoct and wash with water or mash fresh product and apply to the affected area. It is contraindicated for pregnant women and those with physical weakness. Note: Overdosage or oral administration of fresh products may cause poisoning and symptoms such as dizziness, vomiting, and diarrhea. You can take it with cold porridge, or decoct it with 2 to 5 qian of licorice in water. Excerpt: "National Collection of Chinese Herbal Medicine"