In short: Yame Tea Kumaen is a green tea estate in Tokyo, Japan, operated by Yame Tea Kumaen and certified by the Ethical Tea Partnership.
Yame Tea Kumaen is a green tea estate situated in Tokyo, Japan, at approximately 50 metres above sea level. The estate is operated by Yame Tea Kumaen and holds certification from the Ethical Tea Partnership. No buyers have been recorded in publicly available supply-chain data.
Terroir & Climate
At 50 metres elevation in Tokyo's lowland areas, tea cultivation generally takes advantage of Japan's temperate maritime climate, where warm, humid summers and relatively mild winters tend to support vigorous vegetative growth. Estates at this latitude—approximately 35° N—typically experience a pronounced flush cycle, with the most prized early harvests occurring in late April and May when cooler night temperatures can help preserve amino acid content in the leaf.
Low-elevation sites in this region are often characterised by accessible water sources and relatively fertile alluvial soils, though they may experience less diurnal temperature variation than higher-altitude gardens. This can influence the balance of catechins and L-theanine in the leaf, with warmer growing conditions generally favouring faster growth rates. Shading practices, widely employed across Japanese green tea production, may be used to modulate these environmental factors.
Tea Produced
Green tea from estates in the Tokyo lowlands typically reflects the broader stylistic traditions of Japanese tea manufacture, which prioritise fresh, vegetal character and umami depth. Depending on cultivar selection and processing method—steaming duration, rolling technique, and drying regimen—the cup may range from the bright, grassy notes common in lighter-steamed sencha to the richer, more marine qualities associated with deeper-steamed styles. Estates at this elevation often produce teas with accessible sweetness and moderate astringency, though specific cup profiles vary widely with harvest timing and post-plucking handling.
Certifications & Ethics
Yame Tea Kumaen holds certification from the Ethical Tea Partnership, an industry collaboration that sets standards for labour rights, health and safety, and environmental stewardship on tea estates. For buyers, ETP certification provides third-party assurance that the estate has met baseline social and environmental criteria, including fair wages, safe working conditions, and responsible agrochemical use. For workers, membership signals a commitment to ongoing monitoring and improvement in workplace conditions.
Location & Neighbouring Estates
Yame Tea Kumaen lies at 35.6679, 139.5837 in Tokyo, Japan. Its 50 m elevation is the 4th highest of 11 estates we map in Japan. The nearest estates in the TeaTrade directory, measured point-to-point from these coordinates, are:
- Marumatsu Tea Co., Ltd. — 170 km away · Shizuoka
- Kobayashi Aracha Factory — 171 km away · Kikugawa
- Sasaki Green Tea Company — 173 km away · 350 Kamiuchida Kakegawa City
- Aiya Co., Ltd. — 240 km away · Nisho
- Shogyoken Seicha Co Ltd — 358 km away · 54 Kusauchi Miyanogo Kyotanabeshi
Observed Climate at Yame Tea Kumaen (2025)
ERA5 reanalysis data modelled for Yame Tea Kumaen’s coordinates recorded 1,293 mm of precipitation across calendar year 2025. The wettest month was May (259 mm) and the driest was February (13 mm). Daytime highs averaged 21.1 °C and overnight lows 12.7 °C over the year; August was the warmest month and January the coolest.
| Metric | 2025 value |
|---|---|
| Annual precipitation | 1,293 mm |
| Wettest month | May (259 mm) |
| Driest month | February (13 mm) |
| Mean daily high | 21.1 °C |
| Mean overnight low | 12.7 °C |
Frequently Asked Questions
Where is Yame Tea Kumaen located?
Yame Tea Kumaen is in Tokyo, Japan, at coordinates 35.6679, 139.5837, at an elevation of about 50 metres.
Who operates Yame Tea Kumaen?
Yame Tea Kumaen is operated by Yame Tea Kumaen, according to public supply-chain records.
What type of tea does Yame Tea Kumaen produce?
Yame Tea Kumaen is recorded as producing green tea.
What certifications does Yame Tea Kumaen hold?
Yame Tea Kumaen is recorded as holding the following certification(s): Ethical Tea Partnership.
How much rain does Yame Tea Kumaen receive?
ERA5 reanalysis data for the estate's coordinates recorded 1,293 mm of precipitation in 2025, peaking in May (259 mm).
Data sources: public supply-chain disclosures (Ethical Tea Partnership member lists, Rainforest Alliance certificate holders and retailer supplier disclosures); climate figures are ERA5 reanalysis modelled for the estate’s coordinates via Open-Meteo (calendar year 2025); coordinates and elevations from geocoded records. Spotted an error? Email [email protected].
