Guangnan Dendrobium

Guangnan Dendrobium

Guangnan Dendrobium is a geographical indication protected product.

Guangnan Dendrobium is a geographical indication certification trademark.

　　Quality and Technical Requirements for Guangnan Dendrobium

　　I. Species

　　Dendrobium officinale Kimura et Migo.

　　II. Cultivation Environment

　　Within the production area: altitude from 600m to 1800m, average annual relative air humidity of 78%, average annual temperature of 17.3°C, frost-free period of 290 to 310 days, and annual sunshine duration of ≥1500 hours.

　　III. Cultivation Management

　　1. Substrate: Composed of organic materials such as tree bark and sawdust, with a thickness of 10cm to 12cm, pH value of 6.5 to 7.0, organic matter content of ≥10%, and moisture content of 30% to 40%.

　　2. Seedling Cultivation: Propagation through seeds or tissue culture. For tissue-cultured seedlings, rejuvenation is required after the 8th generation.

　　3. Transplanting: From late March to mid-June. Planting density is 150,000 plants or 30,000 clusters per 667㎡ (mu).

　　4. Field Management:

　　(1) Shading: Shading level of 60% to 75%.

　　(2) Fertilization: Apply 1000kg to 1500kg of well-rotted organic fertilizer per 667㎡ (mu).

　　(3) Watering: Maintain relative air humidity of 60% to 80% during the growth period; stop watering 15 days before harvest.

　　5. Environmental and Safety Requirements: The use of pesticides, fertilizers, etc., must comply with national regulations, and environmental pollution must be avoided.

　　IV. Harvesting and Processing

　　1. Harvesting:

　　(1) Method: Harvesting can be done by either harvesting old stems and leaving new ones or harvesting the entire plant.

　　(2) Timing: Full-plant harvesting is carried out from October to March of the following year. Harvesting old stems and leaving new ones can be done year-round.

　　2. Processing: Fresh product is dried at 55°C to 65°C until moisture content is ≤10.0%.

　　V. Quality Characteristics

　　1. Sensory Characteristics:

　　(1) Fresh Product: Yellow-green or dark green in color. Fresh stems have incompletely covered leaf sheaths, forming distinct ring-like gaps (black nodes); easily broken with a clean break; slightly sweet taste, very little residue when chewed, initially sticky and smooth, then becoming thick and viscous.

　　(2) Dried Product: Yellow-green. Easily broken, slightly fragrant taste, mild flavor, slightly sweet afterward, very little fiber when chewed, initially sticky and smooth, then becoming thick and viscous.

　　2. Physicochemical Indicators: Crude polysaccharide content (calculated as glucose) of dried or dried fresh product is ≥26%, moisture content is ≤10%.

　　3. Safety and Other Quality Technical Requirements: Product safety and other quality technical requirements must comply with national regulations.

　　Yunnan Provincial Bureau of Quality and Technical Supervision — Guangnan Dendrobium. The product originates from the administratively governed areas of 18 towns and townships in Guangnan County, Yunnan Province: Liancheng Town, Jiumo Township, Dongbao Township, Yangliujing Township, Babao Town, Banbang Town, Nanping Town, Heizhiguo Township, Shuguang Township, Zhujie Town, Zhuanjiao Township, Nasha Town, Wuzhu Township, Zhulin Town, Zhetu Township, Zhetai Township, Bamei Town, and Dixu Township. “Notice of the People’s Government of Guangnan County on Determining the Geographic Indication Product Protection Scope of Guangnan Dendrobium,” Guangzheng Fa [2012] No. 65. Yunnan Provincial Local Standard: Guangnan Dendrobium (Draft).