Raw Material
Commodity GroupLeafy brassica vegetable (Chinese cabbage type)
Scientific NameBrassica rapa subsp. chinensis
PerishabilityHigh
Growing Conditions- Cool-season Brassica; production is often scheduled to avoid heat stress and bolting risk
- Well-drained yet moisture-retentive fertile soils; reported garden guidance commonly targets pH ~6.0 to 7.5
- Steady water and nutrient supply supports leaf/stalk quality and reduces stress-related defects
Main VarietiesStandard bok choy (thick white/light-green stalk type), Baby/seedling bok choy type, Flowering bok choy form (slender, may bear yellow blossoms)
Consumption Forms- Fresh (commonly cooked in stir-fries and soups)
- Lightly cooked applications where crisp stalk texture is valued
Grading Factors- Leaves intact and free of mechanical damage, disease spotting, and insect infestation
- No yellowing or wilting; firm, glossy leaves with adequate moisture
- Clean, crisp stalks/petioles; minimal blemishes and decay
Market
Fresh bok choy (pak choi) is a leafy Brassica vegetable (Brassica rapa subsp. chinensis) traded primarily as a highly perishable fresh bunch product. It is an Asian-origin crop and is widely cultivated for fresh consumption, with international trade typically serving nearby or time-sensitive markets due to rapid postharvest yellowing and water loss if the cold chain breaks. Product-specific trade statistics are often difficult to isolate because bok choy commonly moves under broader customs groupings for “similar edible brassicas” (e.g., HS 070490 in many datasets). As a result, competitive positioning in global channels is shaped less by long ocean transits and more by regional logistics, reliable pre-cooling, and consistent visual quality at destination.
Major Exporting Countries- 멕시코Major supplier to the United States in HS 070490 (“similar edible brassicas, fresh or chilled”), a grouping that commonly includes bok choy depending on national statistical suffixes.
- 캐나다Significant regional exporter to the United States in HS 070490 (broad brassica grouping; not bok-choy-exclusive).
- 말레이시아Key supplier to Singapore in HS 070490 (broad brassica grouping; not bok-choy-exclusive).
- 중국Major supplier to Singapore and Indonesia in HS 070490 (broad brassica grouping; not bok-choy-exclusive).
- 미국Important regional exporter to Canada in HS 070490 (broad brassica grouping; not bok-choy-exclusive).
Major Importing Countries- 미국Large import market for HS 070490 (“similar edible brassicas, fresh or chilled”); bok choy may be included within this category depending on reporting detail.
- 싱가포르Import market for HS 070490 (broad brassica grouping); commonly supplied by regional neighbors and China.
- 인도네시아Import market for HS 070490 (broad brassica grouping); reported imports are heavily sourced from China.
Specification
Major VarietiesStandard bok choy (thick white or light green stalks), Baby/seedling bok choy, Flowering-type bok choy form (slender with blossoms)
Physical Attributes- Upright clump of dark green leaves with thick white to light green petioles (stalks)
- Crisp stalk texture and glossy, firm leaves are key freshness indicators
- Yellowing, wilting, mechanical damage, and insect injury are common rejection factors
Compositional Metrics- High respiration commodity; respiration rate increases substantially with temperature (reported at both 0°C and 25°C)
- Ethylene production is generally low, but exposure to external ethylene can accelerate yellowing and loss of green color
Grades- No U.S. grade standards for bok choy; export and domestic trade commonly relies on buyer specifications and inspection/condition guidance
Packaging- Typically marketed fresh in bunches and packed in cartons (count packs and bulk cartons are common)
- Packaging and handling aim to limit water loss and leaf damage and to maintain high relative humidity
Risks
Shelf Life Limitation HighFresh bok choy is highly perishable; temperature abuse accelerates yellowing, water loss, aging, and decay, sharply constraining long-distance trade viability and increasing rejection risk at destination.Use rapid initial cooling, maintain ~2°C and very high relative humidity throughout transport/storage, and avoid exposure to ethylene sources and warm handling at cross-docks.
Food Safety MediumFresh leafy vegetables are globally associated with microbiological hazard incidents that can trigger recalls and trade disruptions; controls are required from primary production through packing, transport, and retail handling.Apply Codex-aligned hygienic practices (water quality, prevention of cross-contamination, sanitation programs), and require GAP/GHP-based supplier audits with traceability and recall readiness.
Regulatory Compliance MediumPesticide residue compliance is a recurring trade risk for fresh vegetables; consignments can face border holds or rejection if residues exceed importing-market limits (often benchmarked against Codex MRLs and/or national MRLs).Implement residue monitoring, enforce pre-harvest intervals, and align crop protection programs to destination-market MRL requirements (Codex and national) with documented spray records.
Climate MediumBok choy is sensitive to temperature swings; bolting and quality loss can occur when plants experience stress (including cold-triggered bolting dynamics followed by warming), creating supply volatility and inconsistent product quality.Use seasonally appropriate cultivars, schedule plantings to avoid stress windows, and use protective cultivation (row covers, tunnels/greenhouses) where feasible.
Sustainability- High food loss and waste risk if temperature and humidity control fails during distribution
- Cold-chain energy use and packaging (liners/MAP films) are recurring sustainability considerations for leafy greens trade
Labor & Social- Worker hygiene, sanitation facilities, and hygienic handling in harvesting and packing are central controls for microbiological risk in fresh produce supply chains
FAQ
What cold-chain conditions are recommended for fresh bok choy in trade?Cold-chain guidance commonly targets about 2°C with very high relative humidity (often >95%) to slow yellowing and water loss; near-0°C can extend life but increases freezing risk, so rapid cooling plus stable refrigeration is critical.
Why does bok choy yellow or wilt quickly during transport?Bok choy is a high-respiration leafy vegetable, and warmer temperatures accelerate yellowing and water loss; it can also lose green color when exposed to ethylene, so temperature control and ethylene management strongly affect arrival quality.
Are there official U.S. grade standards for bok choy?No. USDA AMS notes there are no U.S. grade standards for bok choy, and market transactions typically rely on condition/inspection guidance and buyer specifications.